Science can lead us, with each iteration, nearer to the truth. But that doesn't mean that some of its greatest practitioners weren't sometimes way off the mark. Albert Einstein, despite rewriting physics, was wrong about more than a few things. Isaac Newton believed in alchemy and devoted a significant portion of his life to creating a Philosopher's Stone (the making gold kind, not the Harry Potter kind). Edmond Halley, most famous for his discovery that a periodically appearing celestial object was in fact an orbiting comet, believed with his whole heart that the Earth was hollow. He also believed life thrived within the hidden underground spaces of our planet.