SETI, the search for extraterrestrial intelligence. Everyone at one point or another and looks up at the sky and asks themselves, "Are we alone in the Universe?" or "Is anyone else out there?" We still don't know the answer to these questions, but scientists are working hard to find out. Scientists use radio telescopes to attempt to pick up signals sent from other civilizations. Although they have not come up with any results so far, this seems to be the most reasonable way for other poeples to communicate. You can join in on this search using the links below. I highly recommend checking out SETI@home, which lets your computer process data taken from searches for extraterrestrials while your computer is inactive.