Follow your favourite podcasts, listen offline and in the car with CarPlay and Android Auto, and always pick up where you left off. Free to try.
...or why do we live on an onion made of magma?
Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate
Subscribe to It's Okay To Be Smart: http://bit.ly/iotbs_sub
Thanks to Miles Traer and Mike Osborne for geophysics help on this one!
Why does Earth have a liquid core, and how do we know? http://scienceblogs.com/startswithabang/2011/09/28/why-does-the-earth-have-a-liqu/
How many pennies would you have to stack to melt the one on the bottom? http://www.reddit.com/r/askscience/comments/2g8jj9/how_many_pennies_need_to_be_stacked_before_the/
Why are the inner planets rocky and the outer ones are gas giants? http://www.quora.com/Why-are-the-inner-planets-rocky-and-the-middle-planets-large-gas-giants
Produced for PBS Digital Studios
Joe Hanson - Host and writer Joe Nicolosi - Director Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer Katie Graham - Director of Photography Andrew Matthews - Editing/Motion Graphics John Knudsen - Gaffer Dalton Allen - Post-production Intern
Theme music: "Ouroboros" by Kevin MacLeod
Stock images via Shutterstock
----------- Join us on Patreon! https://patreon.com/itsokaytobesmart
