Our understanding of the world has to start somewhere! And while early ideas like the Hollow Earth Theory are mostly wrong and sound silly to us now, that doesn’t mean they weren’t important.

Almost everyone knows about his first voyage. You know, in 1492 Columbus sailed the ocean, dude? Far less people know about his last voyage. He left Spain on what would be his final voyage on May 11, 1502. It didn't go so well. An...

Learn the key characteristics of comets, including their icy composition, the formation of their tails as they approach the sun, and their historical significance. The video also highlights the role of comets in bringing water and...