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TIL hiccups are an evolutionary remnant of amphibian respiration and came before lung respiration. This is supported by the fact that amphibians take in water and air through their gills through a similar mechanism to how we hiccup.

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PY5ee TIL The NHS (The UK's national health service) is the fifth biggest employer in the world.
JbvQ TIL Companies invested 185 million dollars in the CueCat scanner, one of the biggest tech bombs of all time.
R7Lja TIL about Mandate of Heaven, theory in China, according to which the ruler must have the support of Heaven to rule. Moral rulers who care for their people gain the mandate. If a despot sits on the throne, the Heavens can withdraw it, which they signal through e.g. eclipses, floods, wars, plagues etc
X0g7R TIL About Miriam Rodríguez, the 57 year old Mexican mother who hunted down her daughters kidnappers.
RB4 TIL that Dr. Ruth, America’s leading sex psychologist, is a trained sniper.