› added 1 year ago

386

TIL that although you can buy different grades of isopropyl (rubbing) alcohol, 70% is actually most effective for disinfecting; the added water helps it to dissolve more slowly, penetrate cells, and kill bacteria.

Read more webmd.com

via reddit.com

d8mA8 TIL that the "drink 8 glasses of water a day" is founded upon a 1945 recommendation that had no medical basis. Today's medical recommendation is "drink when you're thirsty, unless you're outside on a hot day or you're elderly"
mXpo TIL in 1978 the core structure of the 59 story Citigroup Center in New York City was quietly reinforced after it was determined the skyscraper would fall over in high winds
6ENkJ TIL that gunpowder was invented in the 9th century by Chinese alchemists who were (ironically) searching for an elixir for immortality.
a8QZ TIL that the Universe may exist inside a black hole.
LkjL0 TIL about British general J.F.C. Fuller, whose theories influenced the Nazi's adoption of the blitzkrieg. In 1939, Hitler staged a parade of his mechanized army and asked Fuller "What do you think of your children?"