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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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PY6aZ TIL in 1984 javelin thrower Uwe Hohn threw a distance of 104.8m and became the first and only athlete in history to break the 100m barrier. Shortly afterwards some changes in the design of javelins were implemented and the records had to be restarted, turning his mark into an "eternal world record".
E10Mw TIL Gay men incarcerated in Nazi concentration camps during World War II were forced back into prison even after the Allied forces won that conflict.
0wOAA TIL the ratio between the index finger and the ring finger is affected by testosterone in the womb. People with longer ring fingers are more likely to be masculine, aggressive, have autism, have longer penises (if they're male) and be lesbians (if they're female).
jBdQ TIL that the Germans have a word “Kabelsalat” to describe messy cables. It literally translates as “Cable Salad”.
78Ynp TIL that Dia de los Muertos, despite popular associations with pre-colonial Aztec culture, may have been almost entirely invented in the 1900s by Mexican nationalists