NPR News

Scientists have confirmed that rocks collected recently in the Moroccan desert came from the Red Planet. University of Alberta meteorite expert Chris Herd, who has acquired one of the chunks, talks about how scientists analyze space rocks, and whether organic compounds might be found inside.

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.

In his book Mindfulness: An Eight-Week Plan for Finding Peace in a Frantic World, Oxford University clinical psychologist Mark Williams talks about the brain and body benefits of mindfulness meditation, a cognitive behavioral therapy that can be as effective as drugs at staving off recurring bouts of depression.

Search and rescue operations at the wreck of the Costa Concordia have resumed, after being halted for a third time, due to choppy waters and the partially submerged vessel's tendency to shift on the rocks near Italy's coast.

BBC correspondent Luisa Baldini says the search has resumed, after being called off early Friday.

Here's a roundup of recent developments in the story:

From Italy, Sylvia Poggioli report for NPR's Newscast unit: