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TIL that introverts produce more saliva than extroverts
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4Xp6N
TIL that weird dream like state before you actually fall asleep is called hypnagogia or hypnagogic hallucinations.
wLm01
TIL that Mark Twain wore a signature white suit most of his life but in his autobiography he said “I would like to dress in a loose and flowing costume made all of silks and velvets, resplendent with all the stunning dyes of the rainbow, and so would every sane man I have ever known...”
yVdkl
TIL that having a small amount of insulation on a cylinder (like a pipe or water heater) can actually make it lose heat faster than if it were entirely uninsulated. This is known as the critical thickness of insulation. Having more than the critical thickness makes the heat transfer rate go down.
YpRPB
TIL if you fail your driving test in Switzerland more than 3 times you must take a psychological exam before being allowed to retake it.
wojeE
TIL A Surgeon in Germany killed 4 patients because he used lemon juice instead of antiseptic