› added 3 weeks ago

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TIL drinking less caffeine inevitably makes you more awake, because caffeine blocks the receptors in the brain that encourage you to sleep (adenosine receptors)

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wYk6 TIL the vertical smoke lines you see in nuclear explosions are caused by smoke rockets and not the explosion itself
mWQx TIL that the contract used in The Hobbit is a fully-functioning legal document.
ROBw TIL that before the late 17th century, humans’ sleep cycle was divided into two periods. The first sleep usually began at dusk, lasted four hours, and was followed by an hour or so of being awake. Then we had a second sleep, lasting another four hours.
OGDZa TIL a 2011 study found over 80% of water-based lubricants were toxic to cells and increased risk of HIV-1
Mmg8 TIL in 2003, archaeologists found 20,000 year old human footprints in the Australian Outback of a male they called T8. Scientists determined he was running 23 mph in mud, barefoot, and was even accelerating before the tracks stopped. Usain Bolt’s record for running speed is 27.44 mph.