Reptilian menaces called Silurians evolved on Earth before humankind — at least in the “Doctor Who” rendition of the universe. But science fiction aside, how would we know if some advanced civilization existed on our home planet millions of years before brainy humans showed up?
This is a serious question, and serious scientists are speculating about what traces these potential predecessors might have left behind. And they’re calling this possibility the Silurian hypothesis.
When it comes to the hunt for advanced extraterrestrial civilizations that might exist across the cosmos ... Read even more
