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TIL that since the term Least Developed Country was introduced by the UN in 1971 only four countries have improved to Developing Countries (Botswana in 1994, Cabo Verde in 2007, Maldives in 2011 and Samoa in 2014)

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LkYmr TIL that the first use of an external defibrillator on a human was in 1947 by Claude Beck. The portable version of the defibrillator was invented in the mid-1960s. This machine was a revolutionary idea that has saved hundreds of thousands of lives.
lokxB TIL that the Chicxulub impact crater (from the asteroid that killed the non-avian dinosaurs) can be seen today as a series of sinkholes. The buried rock on the rim of the crater redirects groundwater that causes the limestone above it to dissolve and form sinkholes called cenotes.
gyX8 TIL the band that wrote and performed “Come and Get Your Love” was made up of Native Americans
Abm7 TIL Heroin is a brand name and the drug was originally marketed by Bayer as a non-addictive cough medicine.
4Xbow TIL During the American Revolutionary War more Americans lost their lives from neglect aboard British prison ships in New York Bay than died in all the battles of the war