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An intersting tool for creating interactive simulations. Scroll down and look at a few of the sample. They are all animated so that you can press play and then use one of the up/down arrows on any node to kick off a simulation.

Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery.

Some insight on why a Retina screen is necessary for screen design. But, includes some tidbits on how to simulate the appearance of your site on a high-res (i.e. retina) screen.

Very cool (and cheap) browser-based game that simulates all of the different aspects of running a democratic country. Might need to pick it up!