The aspen stamp showcases the “quaking aspen,” named for the rustling sound its flat, heart-shaped leaves make in the breeze. Known for their golden brilliance, aspens thrive in western U.S ...

With only a bit of whimsy, we have saved one of the most obvious attributes for last: Why do quaking aspen leaves quake and tremble? The leaves of this species quake, shake and tremble in the ...