The History Of Stuff, Part 2

Cats.

Cats were invented in 1898 by Marie Curie. Prior to this, cats had been mythological creatures used only in tales of witchcraft and worshipped by Egyptians. Marie developed the cat using radiation applied to a petrie dish of diced mouse, which she fed to a breeding Ocelot. The resultant offspring were much smaller and easier to use and proved an instant hit in Parisian society. Today cats can be found all over the world except Nova Scotia, where they explode.
Interestingly, cats may emit a strange groaning sound when rubbed vigorously. This is known in collector's circles as 'purring'. If you ever hear this 'purring' do not be alarmed, do not attempt to lubricate your cat in any way, and do not try to return your cat to the manufacturer. Your cat is in perfect working order.