This is another terrific resource: the Library of Visual Manipulatives from Utah State University.
There are one hundred or so simple, interactive programs available spanning Algebra, Geometry, Numbers and Operations, Measurement, and Data. And everything is sorted by appropriate age level. There are certainly a lot of interesting activities to navigate through here.
I’d say this is NSF money well-spent.
This is a cool applet that allows you to explore various fractal “toothpick sequences”:
http://www2.research.att.com/~david/oeis/toothpick.html
A number of options allow the user to look at variants of the object, zoom in, change iteration parameters, and change the underlying sequence. Click the Introduction button for a short overview.
Not sure what ATT Research plans to do with this, but it’s fun to play around with!
This is a mind-blowing set of math/art projects by Daniel Walsh.
http://danielwalsh.tumblr.com/
At the right is a visualization of the magnetic field created by a small triangle of buckyball magnets.
There are only a few posts here, but they are fascinating and stunningly beautiful. I hope there are more coming!
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I admit it. The only reason I bought this squash
was to see if I could use Geogebra to fit a curve to it, like this.
And let me tell you, figuring out that this equation did the job
was not as easy as I thought it would be.
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This is a great interactive Rock-Paper-Scissors game from the New York Times website:
http://www.nytimes.com/interactive/science/rock-paper-scissors.html
The computer will narrate its strategy for you as you play, telling you whether it has correctly predicted your choice or not.
Skeptical? Play the game against the Veteran computer and watch it beat you! Then, go check out this infographic for some tips on how to improve your play.
It might be fun to pit a 6-sided die against the computer to see what happens.