Lapatilla
(FILES) In this picture taken on April 23, 1993 in Paris US geneticist James Dewey Watson poses in front of a blackboard, explaining his work to discover the molecular structure on DNA for which he shared the 1962 Physiology and Medicine Nobel Prize with British Francis Crick and Maurice Wilkins. On April 25, 2013 will be 60 years since Francis Crick and James Watson published their paper unveiling the structure of DNA, the double-helix genetic code for life. AFP PHOTO / DANIEL MORDZINSKI