The red pigments in some fall leaves have proven to be a puzzle for researchers who debate why leaves bother to go red.

Chlorophyll breaks down, revealing the yellow pigment that was there all along. But red? Red is a different story altogether.

In America, many drivers take the ability to turn right at a red light for granted, but the fact is that this time-saving maneuver didn't become commonplace until the 1970s. Although turning right on ...