LOS ANGELES — On TV screens around the room, Chinese table tennis players are whirling and vaulting, but Betty Stein isn’t watching them.
She’s utterly absorbed in the ball coming right at her, and she nails it — 10, 20, 30 times, shooting it back at her enthusiastic, Ukraine-born coach Bella Livshin.
“Gorgeous!” Livshin cries. “A...








