BY JESSICA FIRGER
JENNIFER AND SARAH ROSS are 6-year-old twins, but they couldn’t be more different. Jennifer is quiet, reserved and calm. She likes to dance, do gymnastics and jump on trampolines. She has plenty of friends. Her sister, on the other hand, is all energy. Sarah has trouble sitting still. She has a gift for math and puzzles, and she likes to play video games. While Sarah has only a few friends and is usually content to be on her own in the playground, she does love a captive audience.
“Everyone know I can sing opera?” she asks. “Whaaaa!”