How Were Pregnancy Tests Invented?

Humans have been using urine to test for pregnancy for thousands of years -- with the help of wheat, barley, rabbits, and frogs. Learn how reliable home tests became available in 1978 thanks to immunoassay technology in this episode of BrainStuff, based on this article: https://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/rabbit-pregnancy.htm

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