Why do some leaves turn yellow in autumn, while others turn red? • Leaves contain various coloured pigments. The pigments carotene (orange), xanthophyll (yellow) and chlorophyll (green) are found in ...

This is the time of year when Nicole Hughes gets constantly distracted by the fall foliage as she drives around North Carolina. "I'm always looking," says Hughes, a biologist at High Point University.

Autumn is a big time for trees. Many shed their leaves, and of course, before the leaves fall, they can turn brilliant colors. One of those colors has generated a lot of heated debate among scientists ...

Charles Rennie Mackintosh observed that, “Art is the flower, Life is the Green Leaf,” but I would very humbly add that after the green leaf dies, all those red, orange, and yellow leaves become nature ...