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TIL that normal matter only makes up 5 percent of the total Universe

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R55Lj TIL In the 4th and 5th century BC, Hippocrates was the first to document the heart as a muscle. He described it as pure dark red and pyramidal or spherical, with a liquid film surrounding it to reduce friction
dD4E8 TIL the eruption of Mt. Vesuvius in 79 CE was so hot it turned one victim’s brain into glass
ep6m5 TIL Dolphins call each other by ‘name’ using a unique whistle to identify each other. They only respond to their own names, by sounding a distinct whistle back. Researchers believe dolphins are acting like humans: when they hear their name, they answer.
prZN TIL that, in 1959, Volvo invented the 3-point seat belt, then gave free license to all other car manufacturers to use it.
ZpJGY TIL the word "elektron" in Greek means amber. It was known that when amber was rubbed with a dry cloth, it could attract light objects, such as bits of paper