Every year people ask me, "why haven't the leaves fallen yet?" If autumn starts on September 1 ... trees perceive the world differently than we do. They follow a combination of environmental ...

Next to 'why is the sky blue' and 'where do babies come from,' 'why do leaves turn color in the fall' might be the most frequently asked question about nature. Every autumn, millions of Americans make ...

Every autumn ... the leaves have served as factories where most of the foods necessary for the tree's growth are manufactured. This food-making process takes place in the leaf in numerous cells ...

It’s autumn ... the tree does this, the green chlorophyll is removed, which reveals hidden colours in the leaves. The first colours to appear are yellow, then they turn clear too, revealing ...