April 18, 1943
Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on April 16.

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1987 – The Simpsons first appear as a series of shorts on The Tracey Ullman Show.
1995 – Oklahoma City bombing: The Alfred P. Murrah Federal Building in Oklahoma City, USA, is bombed, killing 168 people including 19 children under the age of six.
2011 – Fidel Castro resigns.