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Have you ever looked closely at metal cutlery after sticking it into hot food? An oil slick on the road? The strange sheen on a beetle? These colours, sometimes called oil slick or neochrome, have a common origin. I wondered where the colour came from and found a couple cool

Cannons are loud. Before an interesting discussion with Tom Mulder, a DPhil student who studies how animals detect vibrations, I imagined that the further from a cannon you were the quieter it would be. This is not true.