Nine-year-old Shienna sat up a little straighter and vocalized her dissent: “That’s not true, three times nine is twenty-six. I memorized it, so I should know.” “Well, you might be right about that,” countered Kelli, “but you were wrong about gravity.  There is no gravity in Arizona – I saw it on TV.” “I know,” Shienna said agreeably, “I once threw a rock in the