Dr. Allan Ropper speaks with residents and fellows as they do rounds at the neuroscience intensive care unit at Brigham and Women's Hospital in Boston. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

Klotho (right) is one of the three Greek Fates depicted in this Flemish tapestry at the Victoria and Albert Museum in London. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

It's the Sichuan peppercorn in dishes like spicy ma po tofu that makes your mouth buzz. Researchers wanted to know if that buzz is connected to the tingling you feel when your foot falls asleep. iStockphoto hide caption

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Can you name the 10 emotions conveyed above? The first six are basic emotions. The last four are complex emotions that combine two of the basic ones. (Check at the bottom for the answers.) Courtesy of Aleix M. Martinez hide caption

itoggle caption Courtesy of Aleix M. Martinez

Researchers say intervention in early childhood may help the developing brain compensate by rewiring to work around the trouble spots. iStockphoto hide caption

itoggle caption iStockphoto

Doctors may eventually be able to diagnose "preclinical" Alzheimer's in patients who have abnormal brain scans but who aren't yet showing behavioral symptoms of the disease. iStockphoto hide caption

itoggle caption iStockphoto

Research in mice offers new clues as to why Harold and Kumar were so motivated to get to White Castle. Todd Plitt/Getty Images hide caption

itoggle caption Todd Plitt/Getty Images

Dennis Aabo Sorensen tests a prosthetic arm with sensory feedback in a laboratory in Rome in March 2013. Patrizia Tocci/Lifehand 2 hide caption

itoggle caption Patrizia Tocci/Lifehand 2