Holocaust survivor Betty Stein, 92, hugs coach Bella Livshin after playing ping pong at a program for people with Alzheimer's and dementia. Founder Mikhail Zaretsksky says the sport does not cure, or even slow down the disease, but helps the 100 participants by raising their heart rate and the blood flow to their brains. He says it helps their depression, improves their balance, and makes them more alert. (2011)