Wolfram|Alpha

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This is a super-useful tool for quick calculations and graphs. Try entering something like “surface area of sun”, “pi to 100 digits”, “life expectancy france 1910”, or “Who formulated the halting problem?” in the search bar!

This website looks like a regular search engine, but returns facts, figures, and charts, rather than just URLs to other pages.

Wolfram|Alpha

PhET Interactive Simulations

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“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.”

PhET Interactive Simulations