To infinity — and beyond!

Little kids readily pick up the idea of infinity. “When I grow up, I'm gonna have a million Barbies."Oh yeah? Well, I'm gonna have a billion." “Well, I'm gonna have infinity Barbies.”” So what? I'll have two infinity of them." Adults laugh, convinced that infinity, , is the biggest number, so 2 can't be any bigger. This is the idea behind a joke in the movie Toy Story. Buzz Lightyear's slogan is “To infinity - and beyond!" We assume there isn't any beyond. Infinity is supposed to be the biggest there is, so by definition there can't be anything bigger, right?