Amazing science reveals that the Cottonwood tree actually makes rhythmic percussive sounds by sucking in air.  This, in turn, creates sap on the tree, which attracts insects and such.  You've got to hear this to believe it.

GreenPeace.org is encouraging its viewers to upload videos that describe their love and passion for the environment.  It's really great to see people finally take passion in something that might be an endangered species in a...