How Ancient Greek mathematician Eratosthenes calculated the Earth’s circumference (VIDEO)
The idea that Earth is a sphere was first introduced by another ancient Greek mathematician, Pythagoras, around 500 BC and validated by Aristotle about 200 years later
A Chinese space lab is falling to Earth!
One remote danger from the Tiangong-1 is that someone will find & pick up a piece of its debris that’s covered in a corrosive substance
Navy pilot recalls encounter with UFO: “I think it was not from this world”! (VIDEO-PHOTOS)
"After 18 years of flying, I've seen pretty much about everything that I can see in that realm, and this was nothing close"
