Where do a zebra's stripes, a leopard's spots and our fingers come from? The key was found years ago – by the man who cracked the Enigma code.
Why does the zebra have stripes? It's not a riddle — scientists say they've actually found an answer. And no, it's not camouflage for hiding under a slatted roof. The stripes actually serve as an insect repellent.
Explanations for why zebras are stripey run a wide gamut: some say camouflage, or that it makes it hard to target individual members of the herd, or even that it's a cooling method. Well, add another one to the list, which at least has some experimentation behind it.