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TIL the Presidential Physical Fitness Test was phased out in 2012

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MKVm TIL that the Dothraki and Valyrian languages in A Game of Thrones are heard by more people than Welsh, Irish Gaelic and Scots Gaelic combined.
Oogma TIL that traditional forest management used a sustainable method of wood harvesting called "coppicing" that would involve cutting a young tree to the stump, and harvesting the shoots in 7-20 years. One square km of coppiced land used produces enough heat for 100 homes a year.
9wyj6 TIL: Bananas are radioactive - Bananas have naturally high levels of potassium and a small fraction of all potassium is radioactive. Consuming one banana would deliver a total dose of 0.01 millirem (0.1 microsieverts) of radiation. (This is a very small amount of radiation)
X0jrX TIL The pistol shrimp can produce a flash of light near the temperature of the sun in addition to a powerfull shockwave similar to a bubble bullet
rRrpM TIL You don't get vitamin D from the sun. You make vitamin D from cholesterol in its inactive form. Inside your cells, this inactive form gets subjected to UV light which is provided by the sun and then gets activated. That's where the whole "vitamin D from the sun" idea comes from.