I happen to be friends with Professor Sandeep Robert Datta, a
neurobiologist at Harvard Medical School. I call him Bob. In the summer
of 2007, Bob and his wife Eliza and their two boys, Jasper and Theo,
came to a pool party for the birthday of my nephew Blake, and the
esteemed neurobiologist splashed around in the water for hours. It was
then that I noticed something on Bob's arm. He had a tattoo.
The
tattoo, I could see, was that most famous molecule, the twisting ladder
of DNA. There was a logic to the choice, since Bob studies the DNA of
fruit flies, observing how mutations to certain genes alter how their
nerves develop and how they behave.
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