In this Jan. 18 photo provided by the NYU Langone Medical Center, a technician examines mice to determine their health at the hospital's complex in New York. New York University/AP hide caption

itoggle caption New York University/AP

Scientists hope a new genetically modified rat will help them find Alzheimer's drugs that work on humans. Ryumin Alexander/ITAR-TASS/Landov hide caption

itoggle caption Ryumin Alexander/ITAR-TASS/Landov

Composer Richard Einhorn lost most of his hearing several years ago, but that hasn't held him back, thanks to state-of-the-art digital hearing aids. Kevin Rivoli/AP hide caption

itoggle caption Kevin Rivoli/AP

A colored 3-D MRI scan of the brain's white matter pathways traces connections between cells in the cerebrum and the brainstem. Tom Barrick, Chris Clark, SGHMS /Science Source hide caption

itoggle caption Tom Barrick, Chris Clark, SGHMS /Science Source

A new study from the Centers for Disease Control and Prevention finds no link between the number of vaccinations a young child receives and the risk of developing autism spectrum disorders. Jeff J. Mitchell/Getty Images hide caption

itoggle caption Jeff J. Mitchell/Getty Images

People who are socially isolated may be at a greater risk of dying sooner, a British study suggests. But do Facebook friends count? How about texting? iStockphoto.com hide caption

itoggle caption iStockphoto.com

George McCann has been diagnosed with a subtype of bipolar disorder called the "fear of harm" profile, and finds that a prescribed dose of ketamine every few days alleviates his symptoms. Michael Rubenstein for NPR hide caption

itoggle caption Michael Rubenstein for NPR

Social worker Nuria Casulleres shows a portrait of Audrey Hepburn to elderly men during a memory activity at the Cuidem La Memoria elderly home in Barcelona, Spain, last August. The home specializes in Alzheimer's patients. David Ramos/Getty Images hide caption

itoggle caption David Ramos/Getty Images

Scientists say that understanding how the cocktail party effect works could help people who have trouble deciphering sounds in a noisy environment. Guests make it look easy at a Dolce and Gabbana Lounge party in London in 2010. Paul Jeffers/AP hide caption

itoggle caption Paul Jeffers/AP

Despite public health campaigns urging women in the U.S. to take folic acid, many are still not taking the supplements when they become pregnant. iStockphoto.com hide caption

itoggle caption iStockphoto.com

State Senator Jeff Klein (L-R), Assembly Speaker Sheldon Silver, Lieutenant Governor Robert Duffy and Senator Andrea Stewart-Cousins congratulate New York Governor Andrew Cuomo after he signed the New York Secure Ammunition and Firearms Enforcement Act on Tuesday. Hans Pennink/Reuters/Landov hide caption

itoggle caption Hans Pennink/Reuters/Landov

If you know some mice that took This Is Spinal Tap too literally, they might want to know about an experiment to restore hearing with a failed Alzheimer's drug. The Kobal Collection hide caption

itoggle caption The Kobal Collection

This satellite image from Oct. 28 shows Hurricane Sandy in the Atlantic Ocean before making landfall. NASA via Getty Images hide caption

itoggle caption NASA via Getty Images