john hawks weblog

paleoanthropology, genetics and evolution

history of biology

  • Steno: not just for stratigraphy

    Sun, 2012-01-15 13:19 -- John Hawks

    Matthew Cobb, guest-blogging at Why Evolution Is True, gives an appreciation of Nicholas Steno's contributions to biology: "Google’s doodle: women have eggs".

    ‘The testicles of women are analogous to the ovary’: in other words, women have eggs. This amazing statement – almost a throwaway comment in a brief section on sharks – was the start of our modern understanding of both human reproduction, and on the essential unity of the animal kingdom.

    Cobb is the author of Generation: The Seventeenth-Century Scientists Who Unraveled the Secrets of Sex, Life, and Growth, which goes through this interesting chapter in the history of science, with names like Steno, Swammerdam, Leeuwenhoek all interconnected with each other.

  • A trip to Darwin's home

    Fri, 2011-09-23 19:13 -- John Hawks

    Today I visited Down House, Charles Darwin's home southeast of London. Mark Pallen, my gracious host from the University of Birmingham, brought us to the house, where we met Randal Keynes. Also on the trip were Brown University biologist and author Kenneth R. Miller, and Captain Ben Kirkup of the Walter Reed Army Institute of Research.

    John Hawks, Randal Keynes, Ken Miller, Mark Pallen, Ben Kirkup at Down House

    Keynes is a great-great grandson of Charles and Emma Darwin, and the author of the book, Darwin, His Daughter and Human Evolution, which became the basis for the movie, "Creation". Hearing from a true family expert on Darwin's life, family and experiments made this trip truly a once-in-a-lifetime experience for me.

    Down House, rear view from lawn

    The house is quite lovely. It sits on bedrock of chalk, and locally flint nodules are such common fieldstones that they've been built into walls -- and memorably, the church in the nearby town where the Darwins attended. The house was owned by the family until 1909, became a school for several years, and was then converted into a privately held museum. It was acquired by English Heritage in 1996.

    At the time of its restoration, family members gathered together the original furniture of the lower floor, and the museum used photographs to restore these rooms to their appearance during Charles Darwin's lifetime. Here is the drawing room:

    Drawing room at Down House

    The flowerpots on the piano recollect the experiment in which Darwin demonstrated that earthworms do not respond to sound from musical instruments (note the nearby bassoon), but do respond to vibrations in the soil (when the pots were placed upon the piano itself).

    There are several rooms on this floor. The most notable is Darwin's study:

    Charles Darwin's study at Down House

    Darwin used the single lens microscope for dissections. I wish I'd gotten a picture of the short wheeled stool that he used here. The billiard room is full of portraits, including this famous one:

    IMG_0746

    The column here is on the veranda, and as Keynes noted to us, the plant trailing up in the photograph was Virginia creeper, now planted outside and showing its beautiful autumn red color:

    Down House, columns and veranda

    The upstairs of the house contains several interpretive exhibits, including some original manuscript pages, artifacts from the Beagle and from Darwin's life at Down House, and a display remembering the death of Charles and Emma's daughter, Annie, at age 10. Adjoining the original house is a small tea room, with an outdoor patio and modern toilets.

    Like the downstairs, much of the grounds has been maintained in its appearance during Charles Darwin's life. Several of his ongoing experiments are being replicated -- a patch of unmown grass where Darwin counted species of plants; a millstone in the ground with a device for measuring the compaction of the soil by earthworms. Fresh worm castings were all over the lawn:

    Worm castings on lawn at Down House

    The kitchen garden is still planted, although in this season not especially lavish in its growth. Flanking the garden is a zoned greenhouse, with various tropical plants including a room full of carnivorous ones.

    Darwin's greenhouse and kitchen garden

    At the rear of the property runs the famous Sandwalk, where Darwin walked five laps around the gravel path on a typical day, marking his laps by nudging stones. Keynes' descriptions of the childrens' experiences with their father in the yard, some conveyed through the family, others hinted by Darwin's writings, were joyful.

    Darwin's Sandwalk, looking back toward Down House

    Tonight I am in Malvern, where Charles took both himself and his daugher Annie for the water treatments. Annie died here, and after a late supper we walked through the darkness to visit her grave in the town.

    But I'll leave remembering a happier note, with many more stories to tell than I can share here:

    John Hawks at the Sandwalk sign at Down House
    Synopsis: 
    Randal Keynes gives a small group of us a wonderful tour of Down House.
  • Galton remembered

    Thu, 2011-06-23 17:17 -- John Hawks

    Steve Jones writes in the BBC News on the occasion of the hundredth anniversary of Francis Galton's death: "Francis Galton: The man who drew up the 'ugly map' of Britain". He cites many interesting tidbits, this was my favorite:

    In a letter to Nature in 1879 entitled The Average Flush of Excitement, Galton recounts a visit to the Derby. He noted that while he was there he was able to assess what he called "the average tint of the complexion of the British upper classes" by observing the distant crowd through his opera glass.

    He observed that after the race started, the crowd became "suffused with a strong pink tint, just as though a sun-set glow had fallen upon it". Galton found that he could work out the mood of a mass of people even without being able to distinguish one person from the next.

  • Kin selection strikes back

    Thu, 2011-03-24 19:37 -- John Hawks

    Last year I noted the publication of a paper in Nature by Martin Nowak, Corina Tarnita and Edward O. Wilson, which claimed that kin selection is not a sufficient explanation for anything in biology. My post ("Inclusive fitness works") basically expressed my incredulity that Nature published the thing.

    This week, Nature published several comments on the paper, including one signed by 137 evolutionary biologists. I think the best source to read is Jerry Coyne's post about the commentary ("Big dust-up about kin selection"):

    If the Nowak et al. paper is so bad, why was it published? That’s obvious, and is an object lesson in the sociology of science. If Joe Schmo et al. from Buggerall State University had submitted such a misguided paper to Nature, it would have been rejected within an hour (yes, Nature sometimes does that with online submissions!). The only reason this paper was published is because it has two big-name authors, Nowak and Wilson, hailing from Mother Harvard. That, and the fact that such a contrarian paper, flying in the face of accepted evolutionary theory, was bound to cause controversy. Well, Nature got its controversy but lost its intellectual integrity, becoming something of a scientific National Enquirer. Oh, and boo to the Templeton Foundation, who funded the whole Nowak et al. mess and highlighted the paper on their website.

    "Scientific National Enquirer"...wow, harsh words, but then the Weekly World News was unavailable for comment...

    Oh, and Richard Dawkins shows up in Coyne's comments section, including the awesome response, "You are still wrecked among heathen dreams."

  • Reflecting on Nabokov

    Wed, 2011-01-26 20:58 -- John Hawks

    Carl Zimmer yesterday had a NY Times article about some new genetic work on butterflies -- the interesting thing was that the work vindicated a scenario for New World butterfly evolution that had been proposed by Vladimir Nabokov.

    It's a cool story, which brought back my days as an English major. I know a lot of people are reading the butterfly thing, thinking "how interesting" that this major figure in literature was a serious lepidopterist. But for me, it brings back some of the joy of reading Nabokov's work.

    "Terra Incognita" is one of my favorite short stories. Nabokov wrote the story in 1931 in Russian, later translated it into English (as he did much of his work). The story is surreal -- the narrator describing a doomed expedition to find tropical insects. The narrator, Valliere, describes his colleagues turning on each other, as their native bearers abandon them. At last he is left alone, dying of fever, to tell the tale. Yet his story becomes evermore infected with hallucinatory details. At times, the outlines of a hospital bed seem to intrude upon his jungle. Nabokov played with this story, dreamlike images showing the narrator's unreliability while leaving us in doubt as to his fate. It's a bit like a short version of Heart of Darkness, here the rationality of the scientist is unwoven by delirium.

    Of course, everybody knows about Lolita. A reader of this book cannot help but be affected by the story, but the genius is the way that Nabokov ratchets up the insane tension of the main character, like an off-key violin.

    For a short introduction to Nabokov, I think one cannot do better than the short story, "Signs and Symbols." The story begins as an older Jewish couple go to visit their son in a mental institution. The son has just survived a suicide attempt, and he is diagnosed with a condition in which he imagines that every random event around him is about him -- a sign about his life and inner consciousness. The couple are turned away and go home through a parade of seemingly random events that clearly refer to their current situation. The reality of their son's situation seems transposed into the very structure of their existence.

    He was such a gifted writer, modernist in an essential way but standing quite contrary to the Hemingway-influenced style of twentieth-century American literature. Sadly, none of these stories are available online, but "Signs and Symbols" and "Terra Incognita" appear in several collections. "Terra Incognita" is such a neat case of art intersecting science -- a literary equivalent of today's scientific confirmation of Nabokov's importance.

    UPDATE (2011-01-29): A reader writes:

    You said the two stories can't be found online. I decided to check that with google, and it turns out the former is freely available, while the latter would require a subscription to the New Yorker.

    http://www.angelynngrant.com/nabokov.html

    http://www.newyorker.com/archive/1963/05/18/1963_05_18_034_TNY_CARDS_000...

    A second reader wrote that all of the originals are readily available in Russia. What may surprise many of you is that this information will be useful to a good number of my Russian readers! Additionally:

    [P]erhaps you'd be curious to hear how he is viewed in Russia. Best I can tell, he is well-respected but generally not viewed as a great writer. Nabokov is more known and respected as an outstanding stylist in Russian language. The story-telling and intellectual aspects of his books are not given that much weight (at least in comparison with other Russian/Soviet greats). Personally, Nabokov the writer always felt like a cold person to me. Seemed to be intellect-driven, calculating prose. Although in this respect it is interesting to note that Nabokov the translator was an utter failure. His translations of Alice in Wonderland into Russian and Onegin into English are, simplifying a bit, universally frowned upon.

    That's probably why his prose appeals to me...it's like a puzzle that you can tell someone elaborately crafted, and rewards repeated reading. But I agree that it doesn't have the spontaneity or feeling that draws me to many of his contemporaries.

  • Species concept overview

    Thu, 2010-10-21 08:30 -- John Hawks

    John Wilkins is an expert on species concepts in biology; he has written a short piece for wide circulation on the topic which is archived at his blog: "How many species concepts are there?" I just lectured on that topic in my introductory course, and it's good to have such an accessible introduction to the topic. In this case, Wilkins focuses on the philosophy -- why are there different concepts, and what do we mean when we say that?

  • Quote: Dobzhansky on the tropics

    Thu, 2010-10-07 08:30 -- John Hawks

    Theodosius Dobzhansky, concluding a paper titled, "Evolution in the Tropics", which considered the role of physical environment versus other factors as evolutionary pressures:

    The effectiveness of natural selection is by no means proportional to the severity of the struggle for existence, as has so often been implied, especially by some early Darwinists. On the contrary, selection is most effective when, instead of more or less random destruction of masses of organisms, the survival and elimination acquire a differential character. Individuals that survive and reproduce are mostly those that possess combinations of traits which make them attuned to the manifold reciprocal dependences in the organic community. Natural selection becomes a creative process which may lead to emergence of new modes of life and of more advanced types of organization.

  • Quote: Huxley and the gorilla mystique

    Tue, 2010-09-21 08:30 -- John Hawks

    Thomas Henry Huxley, in Evidence as to Man's Place in Nature:

    If I have abstained from quoting M. Du Chaillu's work, then, it is not because I discern any inherent improbability in his assertions respecting the man-like Apes; nor from any wish to throw suspicion on his veracity; but because, in my opinion, so long as his narrative remains in its present state of unexplained and apparently inexplicable confusion, it has no claim to original authority respecting any subject whatsoever.

    It may be truth, but it is not evidence.

    Bulldog, indeed.

  • Mailbag: Hiding balls

    Fri, 2010-09-10 09:57 -- John Hawks

    Re: "Darwin hides the ball":

    Just catching up on blog reading after summer holidays and came across your posting: Darwin Hides the Ball. For balance I suggest you read and post on the this article from my friend John van Wyhe:

    http://darwin-online.org.uk/pdf/2007_MindtheGap_A544.pdf

    Thanks for forwarding that reference. Darwin's quote itself doesn't imply he delayed for twenty years, but van Wyhe is quite correct that the later epigraphers make much out of it!

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Neandertals

For years, I've worked on their bones. Now I'm working on their genes. Read more about the science studying these ancient people.

Denisova

From a finger bone of an ancient human came the record of a completely unexpected population. My lab is working on the science of the Denisova genome.

Acceleration

The advent of agriculture caused natural selection to speed up greatly in humans. We're uncovering some of the ways that populations have rapidly changed during the last 10,000 years.

Malapa

Just outside Johannesburg, the Malapa site is producing some of the most exciting finds in human evolution. This site is the headquarters of the Malapa Soft Tissue Project.