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TIL skid marks are not caused by pieces of rubber from the tire being deposited on the road. Skid marks are actually bituminous oils in the asphalt that are heated because of the friction of braking or accelerating rising to the surface, leaving dark marks.

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b9Yw4 TIL in 1999, a study was conducted on the power of crystals vs. placebo. 80 people were asked to meditate with either a quartz crystal or a placebo stone which was indistinguishable from quartz. Most reported feeling typical "crystal effects" irrespective of whether the crystals were real or placebo
Z8elY TIL: Like all male Swiss citizens, Roger Federer was subject to compulsory military service in the Swiss Armed Forces. However, he was ruled "unsuitable" due to an unspecified injury. Instead he served in the civil protection force & was required to pay 3% of his taxable income as an alternative.
R7om6 TIL that the ground cinnamon sold in most stores is actually derived from "cassia", a tree related to "true cinnamon".
E4jX TIL the wage gap has been largely debunked and is actually a misrepresentation, encompassing “all full time women” and “all full time men” without adjusting for basic things like their education, how many hours they work, or even what job they occupy.
LkovQ TIL in 1924, a Russian scientist started blood transfusion experiments, hoping to achieve eternal youth. After 11 blood transfusions, he claimed he had improved his eyesight and stopped balding. He died after a transfusion with a student suffering from malaria and TB (The student fully recovered).