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Matthew Henderson  
"Things of interest in maths & science" created by a PhD candidate in Statistical Dialogue Systems who majored in mathematics as an undergraduate. Posts date back to March 2011, and routinely feature Henderson's original animated gifs: "Orbits around three equally sized planets arranged in an equilateral triangle," "Ranunculoid," "Opposite Cities," "Imagine a cat chasing a mouse," "If you released a ball on a merrygoround....," "The Shepard scale is an audio illusion," "Visual proof which suggests that 1/4 + 1/16 + 1/64… = 1/3," "Imagine taking a globe which had just been painted....," "Draw some random points on a piece of paper and join them up....," "When designing a machine, it's better to mesh gears together whose numbers of teeth don’t share a common factor," "Two touching identical circles have the same area as the negative space they create in a circumscribing larger circle," "Another interesting property of the logarithmic spiral is revealed if you roll it along a horizontal line," and "What would happen in a crowd evacuation in zero gravity?" and "Is it possible to hear the shape of a drum?" and "How can an ant gauge the area of a potential new nest site to see if it is appropriate for its colony?" and "What image is traced by a line moving according to the digits of π?" See also Henderson's online integrator, differentiator, graph plotter, and formula manipulator.  


Levels:  High School (912), College 
Languages:  English 
Resource Types:  Graphics, Calculators, Problems/Puzzles, WebBased Discussions, Recreations, Web Interactive/Java 
Math Topics:  Graphing Equations, Patterns/Relationships, Calculus (Single Variable), Cellular Automata, Fractals, HigherDimensional Geometry, Euclidean Plane Geometry, Number Theory, PreCalculus 
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