My new math-geek bedtime song for kids: "Two plus two is four. Four plus four is eight. Eight plus eight is sixteen. Sixteen plus sixteen is thirty-two. Thirty-two plus thirty-two is sixty-four. Sixty-four plus sixty-four is one hundred and twenty-eight. One hundred and twenty-eight plus one hundred and twenty-eight is two hundred and fifty-six. Two hundred and fifty-six plus two hundred and fifty-six is five hundred and twelve. Five hundred and twelve plus five hundred and twelve is one thousand and twenty-four" (great for teaching kids about RAM upgrades!)