Every fall, the leaves turn orange and yellow and red and we all stop and stare.

But where do those colors actually come from? And why does it only happen in autumn?

In this episode Daniel is standing outside looking at the trees when he asks the question — and what he and Mom figure out together changes the way you'll look at fall color for the rest of your life.

Here's the first thing that surprises most people. The orange and yellow colors were already in the leaf all summer long. They were never created by fall. The green just covered them up. Leaves are green because of a pigment called chlorophyll — and chlorophyll is so dominant during the warmer months that it completely hides everything else underneath.

Then fall arrives. The days get shorter. The tree starts sensing there isn't enough sunlight to keep making food ...