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TIL that melatonin, taken close to the target bedtime at the destination (10pm to midnight), decreases jet‐lag from flights crossing five or more time zones.

Read more pmc.ncbi.nlm.nih.gov

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NX4AP TIL Concrete is the second-most consumed substance on Earth behind only water. Thirty-three billion tons of it are used each year, making it by far the most abundant human-made material in history
rN0ww TIL that NASA’s computers for the Apollo 11 mission in 1969 had less processing power than a modern smartphone. The guidance computer had only 64KB of memory and ran at 0.043 MHz.
x6beD TIL of the "Shoe Fitting Flouroscope" or "X-Ray Shoe Fitter" which existed in shoe stores up until the 70's - Allowing customers (mostly children) to look through a viewer at a live X-Ray of their feet, to see the bones of their toes and how they lined up with the stitching of the shoe's sole.
69mkQ TIL Elvis was an Actual 8th Degree Black Belt in Karate
16VYr TIL that in the year 301, a stonemason was falsely accused of being a woman’s estranged husband. He allegedly fled up a mountain, built a monastery, and lived as a hermit. The isolated mountain community has been self-governing ever since, and is now the modern nation of San Marino.