Mar 8, 2013 — It's already happened. We humans have already met an intelligent alien. Not only that, we almost certainly had sex with them. And we did here, right here on Earth, not so many generations ago.
Nov 26, 2006 — In his new book Thumbs, Toes and Tears, author Chip Walter explores the physical and behavioral traits that are unique to humans. He notes that humans are the only creatures to cry, and that technological advances mark another front in our evolution.