Season 12, Episode 4 Alien Invasion
First Aired: November 6, 2001
A look at infestations by nonnative species around the world. Included: the Caribbean "killer algae" caulerpa taxifolia, which has devastated the Mediterranean and has also been found off California; Asian longhorn beetles, which are killing trees in New York (this segment also explores America's century-long battle with the gypsy moth); dust caused by West African desertification that has found its way to the Caribbean, where it is damaging coral reefs.
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- Rating: TV-G
- Premise: Science, technology and nature are examined with insight, humor and an eye on the practical, with smartly paced reports on such subjects as the big-bang theory, robots, the relationship between stress and illness, and whether we are alone in the universe.… (more)