Physics World <http://physicsworld.com/> is a particularly good read this month. Highlights for me are:
- a historical piece (link<http://physicsworld.com/cws/article/indepth/43030>) on why the US doesn't use the SI system (answer: the phenomenal bad luck of Joseph Dombey); - a review article (link<http://physicsworld.com/cws/article/indepth/43033>) on crowd dynamics, written by Andreas Schadsneider of the Hermes project. The videos on the web-version of this article are great fun. There's also a neat piece of tilt-shift photography (link<http://images.iop.org/objects/phw/world/23/7/30/ball2.jpg>) that reminds us that in a crowd we're really just a particle. -- R
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