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Use this calculator to convert between measurement systems.
Lightning bolts, river deltas, tree branches, and coastlines are all examples of patterns in nature called fractals. In this Snack, you get a striking hands-on introduction to fractal patterns and how they’re formed.
Asked to get an estimate for the famed mathematical constant pi (π), try the random tossing of toothpicks.
This video describes the interaction at the exhibit Pi Toss, which uses a statistical technique called "Buffon's Needle" to calculate pi.
This circular piece of Exploratorium history has held pride of place in π Day festivities since 1988.
Meet Exploratorium physicist Larry Shaw, the originator of Pi Day.
Use straight lines to learn about circles.
String and scissors are all you need to find pi all around you.
Use a touchscreen to search for any number hidden in the first 3 million digits of pi.
A square wheel can roll smoothly—if the "road" is the right shape.
These tiles aren't really crooked–they just look that way.
Toss some chips to estimate pi.
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