A study has shown that a male zebra finch is less likely to court a female zebra finch if he did not form any social friendships with female zebra finches when younger.

Chocolate was used as medicine during the 18th century. It was believed that chocolate could cure a stomach ache.

The first person to die in the electric chair was William Kemmler, an ax murderer from New York on August 6, 1890.

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