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Figure. Britain is marking the 50th anniversary of Watson and Crick's cracking of the DNA code in February with a series of special stamps, but the country's “secret little post office” at Bletchley Park is taking things a step further (www.bletchleycovers.com). Its first-day cover for 5 “Secret of Life” stamps issued Feb. 25 links the decoding of the human genome with the brilliant wartime mathematicians at Bletchley Park who broke Nazi Germany's Enigma code. “It was the work at Bletchley Park that led to the development of the modern computer. This in turn has aided important advances in medical science, not least the decoding of the secret of life.” The stamps themselves show the different stages in the deciphering of the human genome. — CMAJ Photo by: Bletchley Park Post Office