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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

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P1MYZ TIL That the Atlanta episode about a progressive lesbian couple adopting several black children to use for money and clout. Eventually killing themselves when it is found out is based on a true story. Unfortunately in reality they also killed the kids
D1L1e TIL why most people aren't happy with their way of living
a8E5o TIL that elephants were once used as executioners in South and Southeast Asia. In India, rogue elephants were trained to carry out executions by crushing, dismembering, or torturing victims with their immense power.
D1w6J TIL that in over 50 years and 10 billion passengers, the Japanese bullet train has never had a single passenger fatality caused by a derailment or collision.
X0nbR TIL the submachinegun the Australian forces used during WW2 was designed by a 16 year old boy in 1931. During the gun's life, its reliability earned it the nickname "Digger's Darling" by Australian troops. It remained a standard weapon of the Australian Army until 1971.