If a technologically advanced species existed on Earth before us, they may have left a trace. The Silurians, a technologically advanced species of humanoid reptile that predated humans and went into hiding before being rediscovered by everyone's favorite time-traveling extraterrestrial in his phone box, are mentioned in the Doctor Who series. Science isn't working thus far. … [Read more...] about Could An Advanced Civilization Have Existed On Earth Millions Of Years Before Humans? – The Silurian Hypothesis