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Researchers say, for the first time, they've mapped the genetic code of a fetus. Dr.

Mood disorders such as depression are known to increase drug abuse risk. Yet mounting evidence suggests that substance abuse also makes people more vulnerable to depression and the negative effects of stress, according to Eric J. Nestler, chair of neuroscience at the Mount Sinai School of Medicine

Eric Nestler, director of the Friedman Brain Institute at Mount Sinai Medical Center in New York City talks about his article in the December issue of Scientific American magazine, on epigenetics and human behavior, called Hidden Switches In The Mind .

Rebecca Jarvis speaks with the chief of breast surgery at Mount Sinai Medical Center in New York Dr. Elisa Port about where we are and how far we've come in the war on breast cancer.