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TIL Until the mid-1960s in Britain, pregnancy tests were done by sending a woman's urine to a lab, where it would be injected into a toad. The toad was checked two hours later and if it had laid eggs, the woman was pregnant.

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bNeZ TIL of therapeutic hypothermia, the practice of intentionally inducing hypothermia in resuscitated patients for an extended period of time. It has been shown to reduce the chances of brain damage in cardiac arrest sufferers, and is one of the greatest advancements in the science of resuscitation.
BgvQL TIL that MPGe, the miles per gallon equivalent for electric cars, actually measures miles per 33.7 kWh of battery charge, since 1 gallon of gas has the same theoretical energy capacity as 33.7kWh. But MPGe numbers tend to be much higher than MPG numbers because gas engines are so inefficient
98mG TIL it would take ~14.5 Quadrillion Lego pieces to make a minifigure sized earth.
XEKjr TIL of Adam Rainer, the only known person in history to be both a giant and a dwarf, he was 3’8” at age 19, and 7’8” at age 51.
bn09 TIL that there is a parasitic worm in grasshoppers that, when fully grown, makes the grasshopper seek water and drown to return the parasite to water.