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TIL that slugs were used during World War 1 as a method to detect mustard gas well before humans could. The slugs would visibly indicate their discomfort giving soldiers in the trenches time to put on their gas masks.

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P1DXn TIL Temple Lea Houston, the son of Sam Houston, was a lawyer and former gunslinger whose improvised defense of a sex worker is still cited by lawyers as the “perfect closing argument."
JYDmm TIL on the sides of some Australian highways there are signs with trivia questions to keep drivers alert and focused on the road.
9WrQ TIL that Matt Stone and Trey Parker’s favorite episode of South Park is “Terrance and Phillip in Not Without My Anus (1998)”
9Ywxm TIL The virus that causes cold sores is known as the herpes simplex virus (HSV). Despite popular myth, it is almost impossible to catch herpes from contaminated surfaces, towels, or washcloths
LQMO9 TIL the 'Negro Motorist Green Book' was based on an earlier 'Jewish Vacation Guide' book which outlined places that Jews were not unwelcome to stay in America in 1917.