All of Japan's nuclear power plants will be offline by April and might never restart. That's forcing the country to increase its reliance on coal, oil and natural gas. This could cost the country an extra $100 million per day and significantly increase carbon dioxide emissions.
Rhino poaching is on the rise. The animal's horn is believed to have medicinal properties, and some say legalizing the trade could help squelch the black market. One controversial way to reduce poaching may be rhino ranches, where the horns are harvested for sale.
A rigorous analysis of data from studies conducted decades ago suggest that one dose of the hallucinogenic drug could help people stop drinking. It's the latest work to call for further research on therapeutic use of hallucinogens.
Though the immediate nuclear crisis in Japan has passed, the process of securing and stabilizing the radioactive materials from the melted-down reactors will be a long, expensive slog. Recovery workers will also need to decontaminate the area surrounding the plant.
Robert Siegel talks to retired Navy Captain Don Walsh about the attempt by movie director James Cameron to take a submersible capsule to the bottom of the Mariana Trench — the deepest spot on Earth. Walsh says the National Geographic and James Cameron expedition will be a combination of science and adventure, because Cameron is a storyteller and dedicated amateur explorer. Walsh made a 1960 dive to the same trench.
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