What did you think of todays' episode?

We've all heard about Flat Earthers, but have you heard about Hollow Earthers? While mostly out of fashion, there were multiple scientists that believed in either the theory that the Earth has possible planets inside of it, or that we live inside another planet. Notably, Edmund Halley (namesake for Halley's comet) was able to use the science at his time to theorize that there were planets inside Earth. This isn't as wild of a ride as other conspiracy theories, but it's still a trip...to the center of the Earth, or something like that.

Whether it's concave or convex, I'm still vexed.