In the second episode of this two-part series, Robert and Allison check out the possibilities of travelling into the past. From wormholes to the grandfather paradox, there are many arguments for -- and against -- time travel. Tune in and learn more.
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
