› added 6 years ago

110

TIL the sunscreen rating SPF 15 means 1/15th of the UV-B radiation is not blocked. SPF 30 means 1/30th, etc.

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v1yr7 TIL that in Ancient Greece, the famed slingshot mercenaries from Rhodes would often carve taunting messages into their rock projectiles, much like those written on modern-day bombs.
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rNXao TIL A study found that more years of education is correlated with higher life satisfaction, better health, and lower divorce rates even when controlling for income.
epw64 TIL that only the President, Governor, or Mayor of Washington, DC can order flags to fly at half-staff