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Scientists announced Monday that they had created mice with small amounts of human brain cells in an effort to make realistic models of neurological disorders such as Parkinson's disease.

After apologizing for an American science experiment in which Guatemalan prisoners and mentally ill patients were deliberately infected with STDs more than 60 years ago, U.S. officials called on the Institute of Medicine to launch a full investigation. NBC Chief Science Correspondent Robert Bazell reports.

An outbreak of plague that affected four people and a dog in Colorado might be the first instance of person-to-person transmission of plague in the United States in 90 years, officials said Thursday. It started with a sick pit bull, and its owner, two vet techs and a close personal contact of the dog's owner all ended up infected. The dog died but all four people were treated with antibiotics and are okay.

An Indiana woman undergoing surgery in Los Angeles to remove a tumor experienced a twist worthy of a sci-fi plot when doctors discovered an embryonic twin in her brain.