Although the Stegosaurus dinosaur was over 9 metres long, its brain was only the size of a walnut.

Of all the words Dr. Seuss made up in his storybooks, only one has stuck in the English vocabulary: grinch, which is refers to a killjoy -- and it took more than 20 years.

Curly hair follicles are oval, while straight hair follicles are round.

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