Genetic analysis suggests that the ancestors of Aboriginal Australians left Afrika about 75k years ago. This predates the appearance of H. sapiens in Eurasia tens of thousands of years and makes them the oldest continuous culture on the planet.
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Human heart without any blood in it
The first ever insulin pump, developed by Dr. Arnold Kadish in 1963
How epiglottis prevents food from entering the trachea when swallowing.