## Archive for the ‘books’ Category

### Banine’s ‘Jours caucasiens’

April 11, 2019

I have just read the novel ‘Jours caucasiens’ by Banine. This is an autobiographical account of the author’s childhood in Baku. I find it difficult to judge how much of what she writes there is true and how much is a product of her vivid imagination. I do not find that so important. In any case I found it very interesting to read. It is not for readers who are easily shocked. Banine is the pen name of Umm-El-Banine Assadoulaeff. She was born in Baku into a family of oil magnates and multimillionaires. In fact she herself was in principle a multimillionaire for a few days after the death of her grandfather, until her fortune was destroyed when Azerbaijan was invaded by the Soviet Union. In later years she lived in Paris and wrote in French. To my taste she writes very beautifully in French. I first heard of her through the diaries of Ernst Jünger. While he was an officer in the German army occupying Paris during the Second World War he got to know Banine and visited her regularly. It was not entirely unproblematic for her during the occupation when she was visited at her appartment by a German army officer in uniform. She seemed to regard this with humour. The two had a close but platonic relationship.

The society in which Banine grew up was the result of the discovery of oil. Her ancestors had been poor farmers who suddenly became very rich because oil-wells were built on their land. She presents her family as being very uncivilised. They were muslims but had already been strongly affected by western culture. I found an article in the magazine ‘Der Spiegel’ from 1947 where ‘Jours caucasiens’ is described by the words ‘gehören zu den skandalösesten Neuerscheinungen in Paris’ [is one of the most scandalous new publications in Paris]. It also says that her family was very unhappy about the way they were presented in the book and I can well understand that. It seems that she had a low opinion of her family and their friends and the culture they belonged to, although she herself did not seem to mind being part of it. She was attracted by Western culture and Paris was the place of her dreams. As a child she had a German governess. Her mother died when she was very young and after her father had remarried she had a French and an English teacher for those languages. She quickly fell in love with French. On the other hand, she saw having to learn English as a bit of a nuisance. Her impression was that the English had just taken the words from German and French and changed them in a strange way.

After the Russian invasion Banine’s father, who had been a government minister in the short-lived Azerbaijan Republic, was imprisoned. He was released due to the efforts of a man whose motivation for doing so was the desire to marry Banine. She was very much against this. Perhaps the strongest reason was that he had red hair. There was a superstition that red-haired people, who were not very common in that region, had evil supernatural powers. Banine’s grandmother told her a story about an alchemist who discovered the secret of red-haired people. According to him they should be treated in the following way. He cut off their head, boiled it in a pot and put the head on a pedestal. If this was done correctly then the heads would start to speak and make prophecies which were always true. Banine could not help associating her potential husband with this horrible myth. Unfortunately she was under a lot of social pressure and after hesitating a bit agreed to the marriage. Apart from being a sign of gratitude for her father’s release this was also a way of persuading her suitor to use his influence to get a visa for her father to allow him to leave Russia. In the end she accepted this arrangement instead of running away with the man she loved. At this time she was fifteen years old. Her father got the visa and left the country. Later she also got a visa and was able to leave. The last stage of her journey was with the Orient Express from Constantinople to Paris. The book ends as the train is approaching Paris and a new life is starting for her.

### Canards

September 22, 2018

This post follows on from the last one. For the mathematics I want to describe here my main source is the book ‘Multiple Time Scale Dynamics’ by Christian Kuehn. In the last post I discussed the transitions from slow to fast dynamics in a relaxation oscillator. A point where this takes place is a fold point. More insight into the transformations which can be used to analyse the dynamics near a point of this kind can be obtained using geometric singular perturbation theory and this is described in Chapter 7 of Kuehn’s book. The point can be blown up using quasihomogeneous directional blow-ups similar to those which I used in my work with Pia Brechmann on the Selkov oscillator, described here. The main conceptual difference in comparison to our work is that in the case of the fold point there is a small parameter $\epsilon$ involved and it is also rescaled. In this context it is necessary to cover a neighbourhood of the fold point by three charts, in each of which there is a highly non-trivial dynamics. With a suitable analysis of these dynamics it is possible to get information about the transition map from a section before the fold point to one after it. Here the cube roots already seen in the previous post again come up. With this in hand it becomes relatively easy to prove the existence of a relaxation oscillation in the van der Pol system and also that it is stable and hyperbolic. In particular, the existence statement follows from the fact that the return map, obtained by following a solution from a section back to itself around the singular cycle for $\epsilon=0$ is a contraction. There are other ways of getting the existence result but they rely on special features, in particular the fact that the system is two-dimensional. The proof using GSPT is more powerful since it can be more easily adapted to other situations, such as higher dimensions and it gives more detailed results, such as the expansion for the period. For instance in the book it is explained how this works for a case with one fast and two slow variables.

I have not yet mentioned the concept in the title of this post.(I did once mention briefly it in a recent post.) A canard, apart from being the French word for a duck is an idea in dynamical systems which has intrigued me for a long time but which I understood very little about. With the help of Chapter 8 of Kuehn’s book I have now been able to change this. What I will not do here is to try to explain the origin of the word canard in this context. It has led to a considerable number of humorous contributions of varying quality and I do not want to add to that literature here. I recall that at a fold point a non-degeneracy condition $f(0,0,0)\ne 0$ holds. Here $f(x,y,\epsilon)$ is the right hand side of the evolution equation for the fast variable. This means that the slow flow does not stand still at the fold point. A canard is obtained if we assume that $f(0,0,0)=0$ at the fold point while two other non-degeneracy assumptions are made. In this case the fold point is called a fold singularity. This word is used in the sense that sometimes a steady state of a dynamical system is referred to as a singularity. In this case the fold point is steady state of the slow flow. The first non-degeneracy assumption is that  $f_y(0,0,0)\ne 0$. This means that the steady state is hyperbolic. For the other condition the setting has to be extended by introducing an additional parameter $\lambda$. Then we have a function $f(x,y,\epsilon,\lambda)$ and it is assumed that $f_\lambda(0,0,0,0)\ne 0$. In the simplest situation, such as the van der Pol oscillator, the slow dynamics takes place on a critical manifold which is normally hyperbolic and stable. The curious think about  a canard is that there the slow dynamics can follow an unstable critical manifold for a relatively long time before jumping off. More precisely it can remain within distance $\epsilon$ to a repelling part of the slow manifold for a time which is of order one on the slow time scale. Information can be obtained on the dynamics of this type of situation by doing blow-ups. A surprising feature of this type of point is that it is associated with the production of small periodic solutions in a scenario called a singular Hopf bifurcation. Some intuition for this can be obtained by thinking about a periodic solution which starts near the fold singularity, moves a short distance along an unstable branch of the slow manifold (canard), jumps to the stable branch and then returns to its starting point along that branch. A simple example where a canard occurs is the van der Pol system with constant forcing, in other words a system obtained by modifying the basic van der Pol system by introducing an additive constant at an appropriate place on the right hand side.

### Macronectes giganteus

April 15, 2018

Southern Giant Petrel

This blog is named after the Storm Petrel, Hydrobates pelagicus. It is a small bird, looking superficially like a swallow, and with a wingspan of less than 20 centimetres and a weight of about 30 grams. Looking back to my recent trip to South America, I see that the bird which made the biggest impression on me was a relative of the title species, the Southern Giant Petrel, Macronectes giganteus. It is on quite a different scale, with a wingspan of about two metres and a weight of about 5 kilograms. Thus it approaches the size of one of the smaller species of albatross. In form it looks a bit like a giant version of the Fulmar. The first ones I saw were in the harbour of Ushuaia. I then saw many more in flight during the cruise on the Beagle Channel. Before the trip I was not informed about how to distinguish Macronectes giganteus from the very similar Northern Giant Petrel, Macronectes halli. Fortunately for me, Eva was very active with her camera and took a photograph (see above) of an individual in Ushuaia which shows what I later learned to be a characteristic feature of M. giganteus, namely the fact that the tip of the bill is green. There does exist a light morph which is mainly white but we did not see any of those.

### Poincaré, chaos and the limits of predictability

March 5, 2017

In the past I was surprised that there seemed to be no biography of Henri Poincaré. I recently noticed that a biography of him had appeared in 2013. The title is ‘Henri Poincaré. A scientific biography’ and the author is Jeremy Gray. At the moment I have read 390 of the 590 pages. I have learned interesting things from the book but in general I found it rather disappointing. One of the reasons is hinted at by the subtitle ‘A scientific biography’. Compared to what I might have hoped for the book concentrates too much on the science and too little on the man. Perhaps Poincaré kept his private life very much to himself and thus it was not possible to discuss these aspects more but if this is so then I would have found it natural that the book should emphasize this point. I have not noticed anything like that. I also found the discussion of the scientific topics of Poincaré’s work too technical in many places. I would have preferred a presentation of the essential ideas and their significance on a higher level. There are other biographies of great mathematicians which made a better impression on me. I am thinking of the biography of Hilbert by Constance Reid and even of the slim volumes (100 pages each) on Gauss and Klein written in East Germany.

On important discovery of Poincaré was chaos. He discovered it in the context of his work on celestial mechanics and indeed that work was closely connected to his founding the subject of dynamical systems as a new way of approaching ordinary differential equations, emphasizing qualitative and geometric properties in contrast to the combination of complex analysis and algebra which had dominated the subject up to that point. The existence of chaos places limits on predictability and it is remarkable that these do not affect our ability to do science more than they do. For instance it is known that there are chaotic phenomena in the motion of objects belonging to the solar system. This nevertheless does not prevent us from computing the trajectories of the planets and those of space probes sent to the other end of the solar system with high accuracy. These space probes do have control systems which can make small corrections but I nevertheless find it remarkable how much can be computed a priori, although the system as a whole includes chaos.

This issue is part of a bigger question. When we try to obtain a scientific understanding of certain phenomena we are forced to neglect many effects. This is in particular true when setting up a mathematical model. If I model something using ODE then I am, in particular, neglecting spatial effects (which would require partial differential equations) and the fact that often the aim is not to model one particular object but a population of similar objects and I neglect the variation between these objects which I do not have under control and for whose description a stochastic model would be necessary. And of course quantum phenomena are very often neglected. Here I will not try to address these wider issues but I will concentrate on the following more specific question. Suppose I have a system of ODE which is a good description of the real-world situation I want to describe. The evolution of solutions of this system is uniquely determined by initial data. There remains the problem of sensitive dependence on initial data. To be able to make a prediction I would like to know that if I make a small change in the initial data the change in some predicted quantity should be small. What ‘small’ means in practice is fixed by the application. A concrete example is the weather forecast whose essential limits are illustrated mathematically by the Lorenz system, which is one of the icons of chaos. Here the effective limit is a quantitative one: we can get a reasonable weather forecast for a couple of days but not more. More importantly, this time limit is not set by our technology (amount of observational data collected, size of the computer used, sophistication of the numerical programs used) but by the system itself. This time limit will not be relaxed at any time in the future. Thus one way of getting around the effects of chaos is just to restrict the questions we ask by limits on the time scales involved.

Another aspect of this question is that even when we are in a regime where a system of ODE is fully chaotic there will be some aspects of its behaviour which will be predictable. This is why is is possible to talk of ‘chaos theory’- I know too little about this subject to say more about it here. One thing I find intriguing is the question of model reduction. Often it is the case that starting from a system of ODE describing something we can reduce it to an effective model with less variables which still includes essential aspects of the behaviour. If the dimension of the reduced model is one or two then chaos is lost. If there was chaos in the original model how can this be? Has there been some kind of effective averaging? Or have we restricted to a regime (subset of phase space) where chaos is absent? Are the questions we tend to study somehow restricted to chaos-free regions? If the systems being modelled are biological is the prevalence of chaos influenced by the fact that biological systems have evolved? I have seen statements to the effect that biological systems are often ‘on the edge of chaos’, whatever that means.

This post contains many questions and few answers. I just felt the need to bring them up.

### In the beginning was the worm

September 29, 2016

In a previous post I mentioned the book by Andrew Brown whose title I have used here. I came across it in a second hand bookshop in Berkeley when I was spending time at MSRI in 2009. I read it with pleasure then and now I have read it again. It contains the story of how the worm Caenorhabditis elegans became an important model organism. This came about because Sydney Brenner deliberately searched for an organism with favourable properties and promoted it very effectively once he had found it. It is transparent so that it is possible to see what is going on inside it and it is easy to keep in the lab and reproduces fast enough in order to allow genetic research to be done rapidly. The organism sought was supposed to have a suitable sexual system. C. elegans is normally hermaphrodite but does also have males and so it is acceptable from that point of view. One further important fact about C. elegans is that it has a nervous system, albeit a relatively simple one. (More precisely, it has two nervous systems but I have not looked into the details of that issue.) Brenner was looking to understand how genetics determines behaviour and C. elegans gave him an opportunity to make an attack on this problem in two steps. First understand how to get from genes to neurons and then understand how to get from neurons to behaviour. C. elegans has a total of 302 neurons. It has 959 cells in total, not including eggs and sperm. Among the remarkable things known about the worm are the complete developmental history of each of its cells and the wiring diagram of its neurons. There are about 6400 synapses but the exact number, unlike the number of cells or neurons, is dependent on the individual. For orientation note that C. elegans is a eukaryotic organism (in contrast to phages or E. coli) which is multicellular (in contrast to Saccharomyces cerevisiae) and it is an animal (in contrast to Arabidopsis thaliana). Otherwise, among the class of model organisms, it is as simple and fast reproducing as possible. In particular it is simpler than Drosophila, which was traditionally the favourite multicellular model organism of the geneticists.

In this blog I have previously mentioned Sydney Brenner and expressed my admiration for him. I have twice met him personally when he was giving talks in Berlin and I have also watched a number of videos of him which are available on the web and read various texts he has written. In this way I have experienced a little of the magnetism which allowed him to inspire gifted and risk-taking young scientists to work on the worm. Brenner spent 20 years at the Laboratory of Molecular Biology in Cambridge, a large part of it as director of that organization. In the pioneering days of molecular biology the lab was producing Nobel prizes in series. He had to wait until 2002 for his own Nobel prize (for physiology or medicine), shared with John Sulston and Robert Horvitz. In his Nobel speech Brenner said that he felt there was a fourth prizewinner, C. elegans, which, however, did not get a share of the money. My other favourite quote from that speech is his description of the (then) present state of molecular biology, ‘drowning in a sea of data, starving for knowledge’. Since then that problem has only got worse.

Now I will collect some ‘firsts’ associated with C. elegans. It was the first multicellular organism to have its whole genome sequenced, in 1998. This can also be seen as the point of departure for the human genome project. Here the worm people overtook the drosophilists and the Drosophila genome was only finished in 2000. Sulston played a central role in the public project to sequence the human genome and the struggle with the commercial project of Craig Venter. It was only the link between the worm genome project and the human one which allowed enough money to be raised to finish the worm sequence. According to the book Sulston was more interested in the worm project since he wanted to properly finish what he had started. Martin Chalfie, coming from the worm community introduced GFP (green fluorescent protein) into molecular biology. He first expressed it in E. coli and C. elegans. He got a Nobel prize for that in 2008. microRNA (miRNA) was first found in C. elegans. It is the basis of RNA interference (RNAi), also first found in C. elegans. This earned a Nobel prize in 2006. The genetics of the process of apoptosis (programmed cell death) was understood by studying C. elegans. When Sulston was investigated the cell lineage he saw that certain cells had to die as part of the developmental process. Exactly 131 cells die during this process.

To conclude I mention a couple of features of C. elegans going beyond the time covered by the book. I asked myself what we can learn about the immune system from C. elegans. Presumably every living organism needs an immune system to survive in a hostile environment. The adaptive immune system in the form known in humans only exists in vertebrates and hence, in particular, not in the worm. Some related comments can be found here. It seems that C. elegans has no adaptive immune system at all but it does have innate immunity. It has cells called coelomocytes which have at least some resemblance to immune cells. It has six of them in total. Compare this with more than $10^9$ immune cells per litre in our blood. C. elegans eats bacteria. These days the human gut flora is a fashionable topic. A couple of weeks ago I heard a talk by Giulia Enders, the author of the book ‘Darm mit Charme’ which sold a million copies in 2014. I had bought and read the book and found it interesting although I was not really enthusiastic about it. Now TV advertising includes products aimed at the gut flora of cats. So what about C. elegans? Does it have an interesting gut flora? The answer seems to be yes. See for instance the 2013 article ‘Worms need microbes too’ in EMBO Mol. Med. 5, 1300.

August 23, 2015

There are some statements I started to believe at a certain distant time in my life and which I have continued to accept without further examination ever since. One of these is ‘the English-language author who I admire most is Virginia Woolf’. Another is obtained by replacing ‘English-language author’ by ‘author in any language’ and ‘Virginia Woolf’ by ‘Marcel Proust’. At one point in her diary Virginia Woolf writes that she has just finished reading the latest volume of ‘A la Recherche du Temps Perdu’ which had recently been published. Then she writes (I am quoting from memory here) that she despairs of ever being able to write as well as Proust. Perhaps she was being too modest at that point. Until very recently it was a long time since I had read anything by Woolf. I was now stimulated to do so again by the fact that Eva and I were planning a trip to southern England, including a visit to St. Ives. For me that town is closely associated with Woolf and it is because of the connection to her that I was motivated to visit St. Ives when I spent some time in Cornwall several years ago. (Here I rapidly pass over the fact, without further comment, that the author with the widest popular success whose books have an association with St. Ives is Rosamunde Pilcher.) The other aspect of my first trip to Cornwall which is most distinct in my memory is missing the last bus in Land’s End and having to walk all the way back to Penzance where I was staying. We visited Land’s End again this time but since I did not want miss the bus again I did not have time to visit the ‘Shaun the Sheep Experience’ which is running there at the moment. As a consolation, during a later visit to Shaun’s birthplace, Bristol, I saw parts of the artistic event ‘Shaun in the City’ and had my photograph taken with some of the sculptures of Shaun.

When I go on a holiday trip somewhere I often like to take a book with me which has some special connection to the place I am going. Often I have little time to actually read the book during the holiday but that does not matter. For Cornwall and, in particular, St. Ives the natural choice was ‘To the Lighthouse’. That novel is set in the Isle of Skye but it is well known that the real-life setting which inspired it (and the lighthouse of the title) was in St. Ives. This lighthouse, Godrevy Lighthouse, cost a little over seven thousand pounds to build, being finished in 1859. In 1892, on one of two visits there, the ten year old Virginia signed the visitors book. The book was sold for over ten thousand pounds in 2011. So in a sense the little girl’s signature ended up being worth more money than the lighthouse she was visiting. Of course, due to inflation, this is not a fair comparison. Looking on my bookshelves at home I was surprised to find that I do not own a copy of ‘To the Lighthouse’. On those shelves I find ‘The Voyage Out’, ‘Jacob’s Room’, ‘Moments of Being’ and ‘Between the Acts’ but neither ‘To the Lighthouse’ nor ‘The Waves’. Perhaps I never owned them and only borrowed them from libraries. I have a fairly clear memory of having borrowed ‘To the Lighthouse’ from the Kirkwall public library. I do not remember why I did so. Perhaps it was just that at that time I was omnivorously consuming almost everything I found in the literature section in that library. Or perhaps it had to do with the fact that lighthouses always had a special attraction for me. An alternative explanation for the fact I do not own the book myself could be that I parted with it when I left behind the majority of the books I owned when I moved from Aberdeen to Munich after finishing my PhD. This was due the practical constraint that I only took as many belongings with me as I could carry: two large suitcases and one large rucksack. I crossed the English Channel on a ferry and I remember how hard it was to carry that luggage up the gangway due to the fact that the tide was high.

I came back from England yesterday and although I did not have much time for reading the book while there I am on page 236 due to the head start I had by reading it before I went on the trip. The day we went to St. Ives started out rainy but the weather cleared up during the morning so that about one o’ clock I was able to see Godrevy lighthouse and look at it through through my binoculars. They also allowed me to enjoy good views of passing gannets and kittiwakes but I think I would have been disappointed if I had made that trip without seeing the lighthouse.

### ‘There but for the’ by Ali Smith

November 13, 2014

In a previous post I said that I might write something about my impressions of Ali Smith’s novels. Since I just finished reading ‘There but for the’ I thought that this was a good opportunity to do so. The other novels of hers which I have read (both a very long time ago) are ‘Like’ and ‘Hotel World’. I liked the first of these a lot and the second less. I no longer have many concrete memories of the contents of these books and I just want to mention one thing which sticks in my mind from ‘Like’. I am telling this story from memory and I did not go back to check the details. In one episode a young girl growing up in Scotland is alone at home when a woman comes to the door. This woman is of the exotic type called ‘English’. The girl asks her if she would like tea, according to the usual code of hospitality in that social context, which is the one I grew up in. The woman asks her what kinds of tea she has. This confuses the girl completely and would have confused me just as much in the same situation. For us drinking tea was very important and tea was tea. We knew nothing about herbal tea, fruit tea, green tea or special kinds of black tea. I only encountered Earl Grey, for example, as a student. In this context I remember one other experience I had while I was at university. I used to spend the summer holidays with my family. In general our dinner at home, the main meal of the day, always included potatoes. These potatoes grew on our farm and I was involved with planting and picking them as well as eating them. (I mentioned in a previous post how this encouraged my interest in metaphysics.) My grandmother, who lived with the family, loved eating potatoes, in particular potato soup, and towards the end of her life she sometimes said that that she would be quite happy to eat nothing else. The specific memory I wanted to mention is a comment she made on the eccentric habits I had picked up at university. She said, in the context of potatoes, ‘O, Alan he eats rice and pasta and ‘yin dirt’ (standard English translation ‘that rubbish’).

Now let me finally come to ‘There but for the’, I enjoyed reading it a lot and it had the effect of a good novel of somehow modifying my feelings and mood in everyday life. Being confronted with and made to think about certain ideas helps with getting out of certain ruts. I have to say that I cannot recommend the book as bedside reading. I found that when I read it before going to bed it had the effect that my thoughts had such a momentum that they could not easily slow down. I would not advise reading it in public either, unless you are a real extrovert. At any rate I could end up laughing so much that it would make me embarrassed to do so in public.

The book is very up to date in the sense that it features a lot of aspects of our daily life which are very new. There are some things which can creep up on us so that they become familiar without our ever really being conscious that they are there. The book helps to reveal these hidden companions. It is full of humour and wordplay, much of which I appreciated. I imagine that I also missed a lot. I have lived outside Britain and even outside English-speaking countries for many years now and this is bound to mean that various jokes and references were lost on me. Many of the things in the book could be taken as comments on society but the interesting thing is that these comments come from inside. We receive them through a portrayal of the thoughts of individual characters including a young girl (who plays a central role) and an old woman approaching death. We also receive them by hearing the conversation between very different characters and seeing the misunderstandings which limit communication between them. In the end, while I appreciated the text ‘locally’ I was left  with the feeling that I did not understand its global structure. I could see that the snake bites its tail, the end connecting to the beginning, but I felt as if I was left facing a question mark. Was this the author’s intention? Or did I miss something essential? Whatever the answers to these questions I feel that the time I spent reading the book was time well spent.

### Thoughts on Helen Keller

October 19, 2014

I must have seen something about Helen Keller on TV when I was a child. I do not exactly remember what it was and when her name recently came into my mind I could not remember what the story was. I just knew that she had an unusual handicap. Wikipedia confirmed my vague memory that she was deaf and blind. I saw that her autobiography is available online and I started to read it. I got hooked and having been reading a bit each evening I have now finished it. Actually the text is not just the autobiography itself but also has other parts such as some of her letters and text by her teacher Anne Sullivan.

Helen Keller, born in 1880, was left deaf and blind by an illness (it does not seem to be clear what, perhaps meningitis or scarlet fever) at the age of 19 months. Being cut off to such an extent from communication she lost some of the abilities she had already acquired as a small child, although she did invent her own personal sign language. The development was only turned around by the arrival her teacher in 1887. Anne Sullivan was not happy with the way in which people exaggerated when writing about the achievements of Helen and herself. She rightly remarked that what Helen did did not require extra embroidery – the plain truth was remarkable enough. It was claimed that she (Anne) had become Helen’s teacher as a selfless act. She writes that in fact she did so because she needed the money. She had herself been blind for some time before regaining her sight. On the other hand what she did for her pupil was in the end very remarkable. The first route of communication for Helen was through her teacher spelling into her hand. Later on Helen learned to type and read Braille, to write on paper (although in the latter form she could not read what she had written) and to speak (in several languages). She got a college degree despite the special difficulties involved. For instance in mathematics, which was not her favourite subject, there were difficulties for her to be able to understand the examination questions which were presented in a special form of Braille which she was not very familiar with.

I think that the story of Helen Keller can be an inspiration for the majority of us, those who do not have to struggle with the immense difficulties she was confronted with. If we compare then we may complain less of our own problems. Of course she did have one or two advantages. Her family must have been quite well off so as to pay for personal tuition so that she was freed from certain practical difficulties. She had great intellectual gifts which could develop vigorously once a sufficiently good channel of communication to the outside world (and, very importantly, to the world of books) had been established. The prose in her autobiography is of high quality. When she is describing some experience she often describes it as if she had seen and heard everything. This makes a strange impression when you realize that this had to be reconstructed from things her teacher had communicated to her, direct sensations such as smells and vibrations and memories from things she remembered from books. She seems to have had a remarkable talent for integrating all this information. I can only suppose that this integration was done not just for her writing but to create parts of her day to day experience.

The book was published in 1903 and so only contains information about Helen Keller’s life until about the turn of the century. She lived until 1968, was later a prominent public figure and wrote many books. Perhaps in the future accounts of her later life will cross my path.

### Harald zur Hausen and the human papilloma virus

September 27, 2014

I just finished reading the autobiography ‘Gegen Krebs’ [Against Cancer] by Harald zur Hausen. I am not aware that this book has been translated into English. Perhaps it should rather be called a semi-autobiography since zur Hausen wrote it together with the journalist Katja Reuter. If I had made scientific discoveries as important as those of zur Hausen, and if I decided to write a book about it, the last thing I would do would be to write it with someone else. He made a different choice and the book also includes reminiscences by colleagues, even by some with whom he had controversies and who have a very different view of what happened. I have the impression that the amount of material on conflicts with colleagues is rather large compared to the amount of science. I think that many successful scientists tend to selectively forget the conflicts, even if these have taken place, and concentrate more on the substance of their work. Thus I ask myself if this slant in the book comes directly from zur Hausen, or if it comes from his coauthor, or if he himself really tended to get into conflicts more often than other comparable figures. In any case, this aspect tended to make me enjoy the book less than, for instance, the book of Blumberg I read recently.

Let me now come to the central theme of the book. Harald zur Hausen discovered that a type of viruses causing warts, the human papilloma virus (HPV), also cause the majority of cases of cervical cancer. He was also involved in the development of the vaccine against these viruses which can be seen as the second major cancer vaccine, following the vaccine against hepatitis B. For this work he got a Nobel prize in 2008. He pursued the idea that this class of viruses could cause cervical cancer single-mindedly for a long time while few people believed it could be true. The picture in the book is that while there were a number of people thinking about a viral cause for the disease they were fixated either on herpes viruses or retroviruses. Herpes viruses were popular in this context because the first human virus known to be associated with cancer was the Epstein-Barr virus (EBV) related to Burkitt’s lymphoma and EBV is a herpes virus. Early in his career zur Hausen worked in the laboratory of Werner and Gertrude Henle in Philadelphia. I studied (among other things) zoology in my first year at university and part of that, which appealed to me, was learning about anatomical structures and their names. From that time I remember the ‘loop of Henle’, a structure in the kidney. The Henle of the loop, Jakob Henle, was the grandfather of Werner. As I learned from a footnote in Blumberg’s book, the elder Henle was also the mentor of Robert Koch. Incidentally, Blumberg worked in Philadelphia starting in 1964 while zur Hausen went there in 1966. I did not notice any personal cross references between the two men in their books.

It seems that Gertrude Henle ruled with a strong hand. Once when a laboratory technician was ill for a few days she put on so much pressure that the young woman came into the lab one day just to show how ill she was. She did look convincingly ill and while she was there a blood sample was taken. This turned out to be a stroke of luck. Everyone in the lab had been tested for EBV as part of the research being done there and the technician was one of the few who had tested negative. After her illness she tested positive. In this way it was discovered that glandular fever, the illness she had, is caused by EBV. At that point it is natural to ask why EBV causes a relatively harmless disease in developed countries and cancer in parts of Africa. I have not gone into the background of this but I read that the areas where Burkitt’s lymphoma occurs tend to coincide with areas where malaria is endemic, suggesting a possible connection between the two.

One of the key insights which led to progress in the research on HPV was the recognition that this was not just one virus but a large family of related viruses. Those which turned out to be the biggest cause of cervical cancer are numbers 16 and 18. (After some initial arguments the viruses were named in the order of their discovery.) To obtain this insight it was necessary to have sufficiently good techniques for analysing DNA. The book gives a clear idea of how the progress in understanding in this field was intimately linked to the development of new techniques in molecular biology.

When zur Hausen won the Nobel prize it seemed that the German press and parts of the medical establishment had nothing better to do than to attack him, instead of celebrating his success. From the beginning it was suggested that he only got the prize because a member of the prize committee was on the board of one of the companies producing the vaccine and so would have a personal advantage from the publicity. It was also suggested that the vaccine was ineffective and/or dangerous. (The latter point actually led to a decrease in the number of people getting vaccinated and so, presumably, will mean that in the future many women will get a cancer that could have been prevented.) I do not believe that there was any justification for any of the criticism. So why did it happen? The explanation which occurs to me is the (latent or openly expressed) negative attitudes to science and technology which seem rather widespread in the German press and in German society. I find this surprising for a country which has contributed so much to science and technology and derives so much economic benefit from it.

After finishing the book I decided to try to get a small personal impression of Harald zur Hausen by watching the video of his Nobel lecture. It is untypical for such a lecture in that it contains relatively little about the work the prize was given for and instead concentrates on future research directions. According to the book zur Hausen’s co-laureate Luc Montagnier was suprised by that. The subject is zur Hausen’s lasting theme, the relation between infection and cancer. I found a lot of interesting ideas in it which were new to me. I mention just one. It is well known that there are statistics relating to a possible increase in the incidence of leukemia near nuclear power plants. Whether or not you find this data a convincing argument that there is an increased incidence it is fairly certain that you will link the increase in leukemia in this case (if any) to the effects of radiation. I was no exception to the tendency to make this connection. In his talk zur Hausen says that there are similar statistics showing an increase in leukemia near oil drilling platforms. So how does that fit together? If you cannot think of an answer and you would like to know then watch the video!

### My connection to literature

September 23, 2014