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Biologist James Watson (left) and physicist Francis Crick with a model of the double helix, which they first described in Nature on 25 April 1953 (171 737-8). Picture credit: Anthony Barrington Brown.

Biologist James Watson (left) and physicist Francis Crick with a model of the double helix, which they first described in Nature on 25 April 1953 (171 737-8). Picture credit: Anthony Barrington Brown.