History
When pregnancy tests involved injecting urine into frogs
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Before plastic sticks existed, the absolute best way to check for a growing fetus involved terrifying amphibians. Doctors discovered that injecting the potent urine of an expectant mother directly under the slimy skin of an African clawed frog would reliably trigger the animal to violently lay fresh eggs within hours, serving as a highly bizarre but very accurate test.
One discovery leads to another.
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