There’s more to dna than just the double helix we know and love: under some conditions this familiar molecule can take on unfamiliar forms, each of which can have a different impact on our health.

James D. Watson, whose co-discovery of the twisted-ladder structure of DNA in 1953 helped light the long fuse on a revolution in medicine, crimefighting, genealogy and ethics, has died. He was 97.The ...

FILE - President of the Russian Academy of Sciences Vladimir Fortov, right, returns a Nobel prize medal which was sold at auction to a Russian businessman, to U.S. Nobel laureate, biologist James ...