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Four French troops were killed today by a member of the Afghan National Army. The New York Times says there have been dozens of such attacks since 2007. Also today, six U.S. Marines died in a helicopter crash. The cause of the crash isn't known.

Veteran Broadway performer Carol Channing has been onstage for seven decades. A new documentary lovingly profiles the still-sharp, still-charming star of Hello, Dolly.

Christie's New York today auctioned off a rare set of John James Audubon's Birds of America. It didn't come close to the record $11.5 million paid for another full set of the books in 2010. But it was still a hefty price.

Science historian Howard Markel discusses the origins of the word moon and some of the lore surrounding it, including a 1638 book by the English bishop Francis Godwin entitled The Man in the Moone, which recounts a science fiction-style voyage to the moon.

A high-speed video camera is a must for biologist Sheila Patek, of University of Massachusetts at Amherst. Patek studies the lesser-known speed demons of the animal kingdom. A trap-jaw ant can move at over 100mph and a mantis shrimp can accelerate with a g-force of 100,000 (the space shuttle accelerates at 3Gs).

Surgeons in Sweden replaced an American patient's cancerous windpipe with a scaffold built from nanofibers and seeded with the patient's stem cells. Lead surgeon Dr. Paolo Macchiarini discusses the procedure and the benefits of tissue-engineered synthetic organs.

Scientists working with a highly contagious, lab-created strain of bird flu will suspend their research for 60 days. The pause will make possible an international debate on the merits of the work, they say.

The state of Wisconsin has a webcam streaming as workers process more than 300,000 petition pages from the effort to recall Gov. Scott Walker (R). It's silent. You don't know who these people are. They're pushing papers. And it's mesmerizing.

If a Northerner winds up winning Saturday's South Carolina primary, you could argue that it's because the good people of Columbia have the same interests, the same concerns and the same passions as the denizens of Des Moines and Nashua.

Two projects aim to harness renewable energy using cutting-edge technology and engineering. AltaRock's Susan Petty discusses plans to turn hot rocks at a dormant volcano into a source of power. University of Maine's Habib Dagher talks about the potential of deepwater floating wind turbines.