It turns out that Earth's interior is way more wild than you probably thought -- there's liquid metal, hidden oceans, and it's hotter than the surface of the sun. So, what's really going on below our feet? » Subscribe to Talk Nerdy To Me Today: bit.ly/13pYPNQ » Watch More Talk Nerdy to Me Here: bit.ly/XFlOAo HuffPost Science invites you to going the discussion with top scientists covering the latest news in spaceflight, brain/body research, evolution, and the influence of science on culture.