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IRA FLATOW, HOST:

There's ADHD, OCD, DMDD, PTSD, along with hoarding disorder, oppositional defiant disorder and dissociative identity disorder. You will find all of them in the DSM, that's the Diagnostic and Statistical Manual of Mental Disorders, the so-called Bible of psychiatry. The fifth edition of the manual just came out after 14 years in the making, but instead of a round of applause, psychiatrists, psychologists, ethicists, even columnist are panning the book, saying it has outlived its usefulness.

"Office hours are some of my favorite hours of the week," says professor Tom Carlson, a medical doctor, ethnobotanist and instructor of 1700 students annually at the University of California, Berkeley. One of Carlson's former students, SciFri associate senior producer Christopher Intagliata, says Carlson's class got him on the path toward science. In this "Teacher Feature," Intagliata tells his former teacher what the class meant to him.

With the right chemistry, cement can take on some of the properties of a metal, researchers report in the Proceedings of the National Academy of Sciences. Chris Benmore, a physicist at Argonne National Laboratory, explains why a semiconducting cement might be useful.

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. It sounds like something from the movies, but it's true: Researchers unearth an organism frozen inside a glacier, take it back to the lab and discover it's still alive. In this case it's a plant called a bryophyte, a moss that survives being frozen in a glacier in the dark for some 400 years. Wow.

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MICHEL MARTIN, HOST:

I'm Michel Martin, and this is TELL ME MORE, from NPR News. Later in the program, we will meet with actress and producer Rita Wilson. She says passing the big 5-0 has liberated her from her creative rut and is editor-at-large of the Huff/Post50 website. She's now launching a new literary section and inviting other 50-somethings to get those creative juices flowing. She'll tell you more about that in just a few minutes.