The Liftware device, shown here as an early prototype (left) and the final design, starts up automatically when it's lifted from the table. There's no "on" switch to fumble with. Ina Jaffe/NPR hide caption

itoggle caption Ina Jaffe/NPR

Deep brain stimulation eased Shari Finsilver's tremors, but didn't stop them entirely. Here she uses both hands to stabilize a glass of water. Marvin Shaouni for NPR hide caption

itoggle caption Marvin Shaouni for NPR

President Obama has pledged millions of dollars to fuel research into understanding the workings of the human brain. Zephyr/Science Source hide caption

itoggle caption Zephyr/Science Source

Submitting a DNA sample to networking company 23andMe entails spitting a saliva sample into a plastic vial. 23andMe hide caption

itoggle caption 23andMe

In a study, patients with Parkinson's disease, a progressive nervous-system disorder, had fewer falls after taking up Tai Chi. iStockphoto hide caption

itoggle caption iStockphoto