Today we're revisiting one of our scariest episodes of all time, from 2013. From 1916 to about 1927, a strange epidemic spread around the world. It caused unusual symptoms, from drastic behavior changes to a deep, prolonged sleep that could last for months. Between 20 and 40 percent of people who caught the disease died.
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
