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Roswell UFO (1:41)
There has been much controversy around the alleged 1947 UFO crash in Roswell, New Mexico. Learn more about Roswell in this video on HowStuffWorks.
What Are the Odds? Aliens (2:48)
What are the odds that extraterrestrial life exists? Learn more about life on other planets in this video.
Alien Planet: Intelligent Life on Other Planets (5:04)
Scientists discuss the probability of finding intelligent life in Discovery Channel's Alien Planet.
Alien Planet: Finding Alien Life (4:31)
In Discovery Channel's special, Alien Planet, scientists discuss ways that the discovery of alien life could change life on earth.
Alien Planet: Searching for Alien Life (3:54)
In Discovery Channel's Alien Planet, scientists discuss ways they are searching for life on other planets.

