The arrival of pumpkin spice lattes and cooler temperatures may mean fall is on its way, but nothing quite kicks off the season like when the leaves change into those vibrant hues of yellow ...

As daylight wanes and the hours under the stars stretch longer, Mother Nature colors the landscape with an unbe-leaf-able autumn palette. Those jewel-toned pigments of rubies and purples ...

The process shows up as the spectacle of fall foliage. During the summer, leaves appear green because the predominant pigment of photosynthesis, called chlorophyll, reflects green light.