This show featured as its host the scientist Carl Sagan. An astronomy professor at Harvard and Cornell, he was also a prolific writer, whose credits included the book for which this show was named. This show pulled in over half a billion viewers worldwide. And well it might: Sagan, a warm and funny speaker, illustrated the most cogent points about the show's topics and yet never made you feel you were slogging through a difficult textbook. Sagan was one of the first people of the television era to bring science to the public in ways that truly sparked their imaginations. From Michiu Kaku to the Mythbusters, many a science-themed host and program owes much to this gentleman's work. This documentary appears Sunday nights on the Science Channel. Give it a try. Whether you're a student, a parent or just curious about the world around you, "Cosmos" offers much to enjoy.