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TIL Calcium deficiency can contribute to mood problems such as irritability, anxiety, depression, and difficulty sleeping.

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R71la TIL a person who cheats at card games was originally known as a "Card Sharp" not a "Card Shark"
4dNN TIL Mario wears a hat because programmers found it difficult to create the hair movement that would occur when the character jumped.
krD1 TIL that J Edgar Hoover’s largest investigative file was of Eleanor Roosevelt. He believed her civil rights and humanitarian work was too suspicious to not be a communist
M7grb TIL though it's long been prized for its clarity and luxurious feel, "crystal glass," also called Lead Glass, contains up to 40% lead by mass. It has been proposed that the historic association of gout with the upper class was, in part, caused by their extensive use of lead crystal to store alcohol.
1alO7 TIL A scientist embedded LEDs in a prop prosthetic arm to demonstrate an electric eel attack. Each flash in the video represents the firing of the nerves in a potential predator. In each of the volleys at 600 volts, there are 200 pulses per second, a very good rate for causing pain.