Male koalas mark their territory by rubbing their chests on a tree. Male koalas have a dark scent gland in the middle of their chest.

During the making of the the movie "Fight Club," actor Brad Pitt chipped his tooth. However, he did not get his tooth capped until after the movie was done filming as he thought it would look better chipped for his character.

The household wrench was invented by boxing heavyweight champion Jack Johnson in 1922.

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