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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. Fifty years ago this week, a team of researchers at General Electric created something new: a solid-state device that could emit visible red light without getting hot like a light bulb. Other groups have made light-emitting devices, but this was the first practical one that could make light that a person could see, rather than invisible infrared light.

For nearly a decade, scientists and Northwest tribes in Washington state fought bitterly over whether to bury or study the 9,500-year-old bones known as Kennewick Man. Scientists won the battle, and now, after years of careful examination, they're releasing some of their findings.

For starters, Kennewick Man was buff. I mean, really beefcake. So says Doug Owsley, head of physical anthropology at the Smithsonian's National Museum of Natural History, and the man who led the study of the ancient remains.

A life well-worth noting has caught the attention of obituary writers:

-- "Andrew F. Brimmer, a Louisiana sharecropper's son who was the first black member of the Federal Reserve Board and who led efforts to to reverse the country's balance-of-payments deficit, died on Sunday in Washington. He was 86." (The New York Times)

Fidel Castro's son, Alex Castro, is batting away rumors that his father, the former leader of Cuba, had died.

"The commander is fine, doing his daily things, reading, exercising," Alex Castro said.

The 2012 Nobel Prize winners were announced this week, and research on stem cells, cloning, cell receptors and quantum optics took center stage. Experts discuss how the work of this year's Nobel laureates changed our understanding of our bodies, and the world around us.