Science

Animated Newton's Cradles

I'd forgotten, but this was the first thing I remember really hunting for online about seven years ago. I knew it would be there, somewhere.

Very Elegant...
http://www.lhup.edu/~dsimanek/scenario/newton.htm

And I think this is the first one I originally found...
http://www.walter-fendt.de/ph14e/ncradle.htm

Beautiful Periodic Tables

http://www.colorado.edu/physics/2000/applets/a2.html

http://www.rsc.org/periodic-table/

Your Age and Weight on other Planets

Your age on another planet
http://www.exploratorium.edu/ronh/age/

Year weight on another planet
http://www.exploratorium.edu/ronh/weight/

How Big is Everything?

http://scaleofuniverse.com/

Can you Design a New Animal?

http://www.switcheroozoo.com/zoo.htm