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TIL technical and commercial divers will breathe a mixture of oxygen, nitrogen, and helium known as trimix. Some of the nitrogen in air is replaced with helium to reduce the narcotic effect of breathing nitrogen under pressure, allowing them to dive deeper while maintaining a clear head.

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AD6E7 TIL that there are 100 folds in a chefs hat and that the 100 folds represent the 100 ways to cook an egg.
9YwZr National Geographic explorer Helle Olsen explains why mandrills have such colourful bums.
yQLOl TIL Keith Moon once tried to put a hotel waterbed mattress in an elevator as a prank but it burst. He complained to the manager and convinced them it leaked and ruined his stage clothes. The hotel apologized and moved them to the antiques-filled Presidential Suite, which they demolished that night.
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