Earth might have spun on its side to keep its balance in the distant past, and could do so again, scientists reported today. Alaska was suddenly at the equator, the thinking goes. Scientists already know that the North Pole wanders over time. But a theory known as true polar wander suggests that if a very heavy object, like an oversized volcano forms far from the equator, the force of the planet's rotation would pull the object away from the axis the Earth spins around. Should a mass such as the very heavy volcano become unbalanced, Earth would tilt and rotate...