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The Russian search company has just announced a collaboration with Twitter. Here's how they're becoming more like Google--and also how they also zag with every Google zig.

In this month's edition of Physics World, David Wilkinson, visiting fellow at Nottingham Trent University and former project manager in the UK Home Office Scientific Development Branch, explains how physics is at the forefront of police weapons testing, making sure that potential devices meet the strict criteria set out by the UK government.