› added 4 years ago

53

TIL that because human fast-twitch muscles contract and relax up to 70 times per second, you can clench your first tightly, hold it close to your ear, and hear it vibrating.

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N7RxN TIL that a fifth of people in Greenland have attempted suicide, which is four times the global prevalence.
b9L6N TIL that the same engineer who was responsible for adding lead (TEL) to gasoline was also responsible for the widespread use of CFCs as refrigerants. The same person was responsible for two of the worst air pollutants of the twentieth century.
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