Fall is marked by the slow, beautiful change of green foliage to vibrant colors. As the temperatures drop and the days grow shorter, leaves stop making chlorophyll, a pigment responsible for the ...

The time when trees change color and then drop their leaves is a signpost of the year, a mark of the familiar cycle of the seasons. Early to mid-October is typically the height of the color in ...

Although the chemistry of autumn colours is well understood, there is an ongoing and lively debate among scientists about why trees evolved their vivid autumn colours in the first place. Driving north ...