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

What Pranks Have Astronauts Pulled?
08:40

How Can Your Body Learn to Tolerate Cold?
10:58

How Did the War of 1812 Settle the American Revolution?
10:23