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Til the Sasanian Persians gassed Roman soldiers with sulfur dioxide during the Siege of Dura Europos. One of the earliest examples of chemical warfare

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rGZy TIL In research there is a demand characteristic known as the “Screw-You Effect” - when participants attempt to ruin the results of a study
lMga TIL “Aluminum” started as a misspelling of “Aluminium” on a handbill by Charles Martin Hall, the American Industrialist who made Aluminum production practical
VMJyB TIL Japan's infamous suicide rate is only 4.2% higher than the US's, and their male rate is lower.
Ooe6 TIL that Robert A. Heinlein developed the concept for the waterbed.
R7MvQ TIL the sky in the famous painting "The Scream" is red probably because of the worldwide effects of Krakatoa's eruption in 1883, which launched particles in the air that changed the sky color for about 5 months