Category Archives: biology

Life Curves

J. John Sepkoski, Jr., was a fossil-hunter who did most of his digging in the library, sifting through the literature of paleontology to build a detailed, quantitative timeline of life on earth. Focusing on marine animals, he recorded the earliest … Continue reading

Posted in biology, computing, science, statistics | 4 Comments

Last name first

Saturday’s New York Times had a story by Sam Roberts about a newly released Census Bureau study of the frequency of surnames in the U.S. The Times story was mainly about the names at the top of the list, and … Continue reading

Posted in biology, mathematics, modern life | 6 Comments


Above: A throbbing, wheeling mob of several thousand restless starlings, near a strip mall in Clayton, North Carolina, 27 October 2007. Below: Snow geese on maneuvers near Ashburn, Missouri, 12 November 2004. In the 1930s, Edmund Selous argued that flocking … Continue reading

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The family tree

When is a tree (large, woody plant) not a tree (connected acyclic graph)? This has something or other to do with the topic of the previous post. (The tree (?) is a crepe myrtle near the campus of North Carolina … Continue reading

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How many of your ancestors are you related to?

David Aldous asked me that question over lunch one day. I didn’t have an answer, so he explained: In the simplest model of human genetics, you get half your genes from each parent, a fourth from each grandparent, and so … Continue reading

Posted in biology | 9 Comments