And why do we have seasons? Well, the answer has to have something to do with the sun, which is here, and the Earth, represented by this orange. The answer lies in the way that the Earth spins on ...

While Earth's slowdown is not noticeable on human timescales, it's enough to work significant changes over eons. One of those ...

MADDIE: That’s why every four years we have to add another day to February ... CHILD: I know what’s always changing on Earth - the seasons! MADDIE: The seasons change because the Earth is ...