Ask The Naked Scientists

Ask the Naked Scientists SA episode

Fri, 2nd Jan 2015

Why do pigeons bob their heads?

Pigeon (c) Jean-Daniel Echenard

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? Why can people suddenly lose senses? Plus, an update on Ebola.

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Hi all, I recently read this article ( about how chameleons change their colour and it says "that the changes take place via the active tuning of a lattice of nanocrystals present in a superficial layer of dermal cells called iridophores" and not via colour pigments. I understand that the research was published after this podcast, but as I read this article I remembered listening about chameleons here and thought I would comment about it. saligari, Sun, 22nd Mar 2015

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