My daughter, the future doctor, on:

The heart

"The heart's not in your tummy. It's in your chest. It goes 'Beep! Beep! Beep!' Kitty has a heart, Tuna has a heart, Mommy has a heart, Daddy has a heart and MomMom has a heart."

"Does PopPop have a heart?"

"No, I think not."

Sorry dad, them's the breaks. But we'll take you to the wizard and get you hooked up.