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Screenshot from video with the face of a great white shark swimming at the screen.
video

Are Sharks Scary?

 What is scarier: sharks or extinction? This video from Save Our Seas puts whether...
Fri, 12/18/2009 - 14:20
Color illustration of an ancient bivalve.
Photo

Elevator Rudists

 These "elevator" rudists, an ancient bivalve, used one long heavy valve to anchor...