Explore the Nature of Science through Simulation
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This is the portal to an NSF-sponsored project. The PI is Tim Erickson (tim, eeps, com, connected the usual way).
For now we're offering it free. This is the August 2008 version. Go ahead and sign up to be a premium user. Don't give any real credit-card information, just a real e-mail address. You'll receive a confimation code. Use it to set up your premium account!
Link to the old home page