Jack Cohen obituary
The biologist Jack Cohen, who has died aged 85, worked on animal reproduction and the development of feathers and hair; his Living Embryos (1963) became a standard university text. He also co-authored popular science books and science fiction, and designed alien creatures and ecosystems for science fiction writers. But he will be best remembered for the bestselling four-book series The Science of Discworld, which he wrote with Terry Pratchett and me.
I first met Jack in 1990, when he phoned me at Warwick University. "Hello, I'm Jack Cohen. I have a question about your book on chaos theory. Can we meet?" We had lunch at a pub in Kenilworth, and four hours later we were still there, having discovered that a mathematician and a biologist could have far more in common than they expected.
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