On a late summer evening in 1977, Ohio radio astronomers discovered a strong, interstellar signal that is believed by many to be the best evidence of communication from an extraterrestrial civilization. Famously known as the 'Wow. Signal', its origins remain a mystery, and continue to intrigue. In today's ongoing search for extraterrestrial intelligence, there are those who think the Wow. Signal is the real thing, while others feel that actual evidence of intelligent life beyond our own is not within our grasp.