Why do pigeons bob their heads?

How do chameleons change colour? Why do pigeons bob their heads? How do railguns work?
02 January 2015

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Pigeon

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How do chameleons change colour? Why do pigeons bob their heads when they walk? How do railguns work? Can you freeze dry a body? What causes localised hair-loss? What's the best way to cool down beer? Plus, an update on Ebola...

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