Little Susie, a six-year-old, came home from school whining, Mommy, Ive got a stomachache. Thats because your stomach is empty, her mother replied. Youd feel better if you had something in it. She gave Susie a snack and sure enough, Susie felt better right away. That afternoon the family's minister dropped by. While he was chatting with Susie's mom, he mentioned he'd had a bad headache all day long. Susie perked up. Thats because its empty, she said. Youd feel better if you had something in it.