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TIL that the ‘sound’ produced by an ultrasound machine is made from applying an electrical current to piezoelectric crystals

Read more science.howstuffworks.com

via reddit.com

nWlrd TIL in June 2021, Boryana Straubel, wife of Tesla co-founder J.B. Straubel, was struck and killed while riding a bicycle on a highway shoulder in Nevada. She managed a family foundation that focused on environmental sustainability. The driver of the car that hit her was unlicensed.
wLnvW TIL that Jennefer Lopez is not in fact married or even related to George Lopez
kJdN4 TIL: American inventor William Richardson created an enhanced swimming apparatus around 1880, enabling users to reach speeds between 4 and 6 miles per hour. The device utilized a central longitudinal shaft to transfer cranking movements of hands and feet to a four-bladed propeller.
bnV4 TIL In Denmark it is considered in very bad taste and down right rude to boast about, or do anything that draws attention to yourself.
pYy8b TIL while inhaling helium can make your voice sound high, there is a gas that does the opposite and makes your voice sound lower - sulphur hexafluoride. But by displacing oxygen in the lungs, it also carries the risk of asphyxia if too much is inhaled.