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.

With the fall season nearing, many are anticipating the time when leaves begin to turn shades of red, yellow and orange. In Louisiana, leaves are expected to begin changing colors in late October, ...

The red pigments in some fall leaves have proven to be a puzzle for researchers who debate why leaves bother to go red. Why do only some leaves turn red in the fall? Scientists can't agree on an ...