When did we start believing in Martians? Why did we stop?

Today, we have rovers busily studying the surface of Mars, but 100 years ago, it wasn't uncommon for people to believe that intelligent Martians occupied the Red Planet, and 100 years before that, visions of Moon dwellers danced in many people's heads. Where did these ideas of nearby intelligent extraterrestrials come… » 9/08/13 8:30am 9/08/13 8:30am