The Rabbit Test

After the discovery of hormones in the early 20th century, new methods of pregnancy testing were developed. Some of these involved animal use, but how did the rabbit test work, and when did it get replaced?

Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm

And to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices