New Hiroshima bombing photo shows split mushroom cloud

A photograph that shows the Hiroshima atomic bomb cloud split into two sections, one over the other, has been released by the curator of a peace museum in Japan. It was discovered on Monday among a collection of some 1,000 archival items related to the bombing, all of which are now in the possession of Honkawa Elementary School in Hiroshima city.

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Excellent vintage film about the first accurate atomic clock

This short film was produced by the film unit of the UK's National Physical Laboratory (NPL) in the 1950s, and explains the principles behind the first accurate atomic clock, which was designed by Louis Essen and built at the National Physical Laboratory in 1955. The NPL's YouTube channel has other videos of interest to science geeks. (thanks, obadiahlemon)