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Many viewers asked for an explanation of the video - as it is not obvious that the funny wriggling worm is actually made of particles moving in straight lines, and bouncing off the boundary of the ellipse. This simulation shows the trail left by every tenth particle, each of which is highlighted in a different color. Thanks to the viewers suggesting this! Music: “Book Bag“, by E’s Jammy Jams For more information, see (in French, some with a Spanish translation)
