Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsCalculating the Earth's Circumference at Any Date from Any Locationhttp://demonstrations.wolfram.com/CalculatingTheEarthsCircumferenceAtAnyDateFromAnyLocation/]]>http://demonstrations.wolfram.com/CalculatingTheEarthsCircumferenceAtAnyDateFromAnyLocation/Dudeney's Proof of the Pythagorean Theoremhttp://demonstrations.wolfram.com/DudeneysProofOfThePythagoreanTheorem/]]>http://demonstrations.wolfram.com/DudeneysProofOfThePythagoreanTheorem/Fundamental Theorem of Arithmetichttp://demonstrations.wolfram.com/FundamentalTheoremOfArithmetic/]]>http://demonstrations.wolfram.com/FundamentalTheoremOfArithmetic/Gridiron Pendulumhttp://demonstrations.wolfram.com/GridironPendulum/]]>http://demonstrations.wolfram.com/GridironPendulum/Motion of Pendulum with Varying Lengthhttp://demonstrations.wolfram.com/MotionOfPendulumWithVaryingLength/]]>http://demonstrations.wolfram.com/MotionOfPendulumWithVaryingLength/Leonardo da Vinci's Ornithopterhttp://demonstrations.wolfram.com/LeonardoDaVincisOrnithopter/]]>http://demonstrations.wolfram.com/LeonardoDaVincisOrnithopter/Equality of a Segment and an Arc in Archimedes's Spiralhttp://demonstrations.wolfram.com/EqualityOfASegmentAndAnArcInArchimedessSpiral/]]>http://demonstrations.wolfram.com/EqualityOfASegmentAndAnArcInArchimedessSpiral/Nicomedes's Mechanism for Constructing a Conchoidhttp://demonstrations.wolfram.com/NicomedessMechanismForConstructingAConchoid/]]>http://demonstrations.wolfram.com/NicomedessMechanismForConstructingAConchoid/Primitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's Formulahttp://demonstrations.wolfram.com/PrimitivePythagoreanTriplesOnACurvilinearGridDefinedByEuclid/]]>http://demonstrations.wolfram.com/PrimitivePythagoreanTriplesOnACurvilinearGridDefinedByEuclid/World Energy: Electricity, Oil, and Gashttp://demonstrations.wolfram.com/WorldEnergyElectricityOilAndGas/]]>http://demonstrations.wolfram.com/WorldEnergyElectricityOilAndGas/Archimedes' Approximation of Pihttp://demonstrations.wolfram.com/ArchimedesApproximationOfPi/]]>http://demonstrations.wolfram.com/ArchimedesApproximationOfPi/Antikythera Mechanismhttp://demonstrations.wolfram.com/AntikytheraMechanism/]]>http://demonstrations.wolfram.com/AntikytheraMechanism/Dynamically Updated Probabilistic Galton Boardhttp://demonstrations.wolfram.com/DynamicallyUpdatedProbabilisticGaltonBoard/]]>http://demonstrations.wolfram.com/DynamicallyUpdatedProbabilisticGaltonBoard/Three Proofs of the Pythagorean Theoremhttp://demonstrations.wolfram.com/ThreeProofsOfThePythagoreanTheorem/]]>http://demonstrations.wolfram.com/ThreeProofsOfThePythagoreanTheorem/The Eratosthenes Machine for Finding the Cube Root of Twohttp://demonstrations.wolfram.com/TheEratosthenesMachineForFindingTheCubeRootOfTwo/]]>http://demonstrations.wolfram.com/TheEratosthenesMachineForFindingTheCubeRootOfTwo/Trisection by Sliding a Linehttp://demonstrations.wolfram.com/TrisectionBySlidingALine/]]>http://demonstrations.wolfram.com/TrisectionBySlidingALine/Pascal's Angle Trisectionhttp://demonstrations.wolfram.com/PascalsAngleTrisection/]]>http://demonstrations.wolfram.com/PascalsAngleTrisection/Pascal's Barrelhttp://demonstrations.wolfram.com/PascalsBarrel/]]>http://demonstrations.wolfram.com/PascalsBarrel/First-Order Solution to Glass-Ice Stefan Problemhttp://demonstrations.wolfram.com/FirstOrderSolutionToGlassIceStefanProblem/]]>http://demonstrations.wolfram.com/FirstOrderSolutionToGlassIceStefanProblem/Solve the Loculus of Archimedeshttp://demonstrations.wolfram.com/SolveTheLoculusOfArchimedes/]]>http://demonstrations.wolfram.com/SolveTheLoculusOfArchimedes/