Sunshine Buddies

For hundreds of years, scientists have been searching for a perpetual motion machine, one that can continue running under its own power indefinitely. And now, quietly, toy maker Tomy have found a solution with their Sunshine Buddies. "They work on the theory of perpetual motion," says the ad copy. They sit smiling in the sun, rocking their heads back and forth with absolutely no external power source needed! Except the sun. Because they're solar powered. What? $12.99 USD. (Thanks, Mamster!)