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Hunt for Alien Earths - July 2009Astronomers may be on the brink of finding Earth-like planets beyond our solar system.
Hurricane Katrina - Oct. 2005Our January 2005 segment on New Orleans' risk from hurricanes proved sadly prescient, as this update reveals.
Hurricanes - Jan. 2005Predicting a hurricane's intensity is notoriously difficult, but new tools may make it easier.
Island of Stability - Oct. 2006Follow the decades-long quest to create the elusive element 114.
Ivory-Billed Woodpecker - Jan. 2006An enchanting bird believed extinct mysteriously reappears ... maybe.
Killer Microbe - July 2008A relatively benign bug becomes a highly lethal pathogen, known to U.S. soldiers as Iraqibacter.
Kryptos - Jul. 2007A coded sculpture at CIA headquarters has yet to be fully broken.
Lab Meat? - Jan. 2006Scientists can grow edible meat in culture from a few animal cells. Bon appétit?
Leeches - July 2008A century after falling out of favor among doctors, medicinal leeches are back in hospitals, sucking away on patients' wounds.
Lightning - Oct. 2005Experts still aren't sure what triggers it, but they suspect cosmic rays from outer space.
Little People of Flores - Apr. 2005The remains of three-foot-tall humans are discovered on a remote Indonesian island.
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