The chemistry of dozens of streams and rivers across the U.S. is changing. Waters are becoming more alkaline — the opposite of acidic. And the reason is counterintuitive — researchers believe that acid rain is to blame.
Planthoppers are champion jumpers - launching themselves upward, hundreds of times their own height, in just a couple milliseconds. They achieve this feat with the help of cog-like teeth on their legs — the first mechanical gear system ever found in nature.
"This is the real deal. Voyager 1 has finally reached interstellar space; the first time a spacecraft has been in the space between the stars," says one project scientist. Launched in 1977, the probe has been surveying the solar system.
Investigative journalist Eric Schlosser explores the dilemma that has existed since the dawn of the nuclear age: How do you deploy weapons of mass destruction without being destroyed by them? He joins guest host Steve Roberts in studio to talk about his new book, "Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety."
Cut a tumor from a child's brain and you may save a life. But surgery can hurt the child if healthy brain cells are removed. A Seattle doctor is working on a substance that might help. It binds tightly to cancer cells and makes them glow, so they're easier to distinguish from healthy tissue.
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