A Binary Marble Adding Machine by Matthias Wandel of Woodgears.ca. “When the rocker is set to the left, that represents a zero. When it’s rocked to the right, it’s set to one.” You can watch this for the math, watch this for the math with a paper and pen, or just watch how the marbles fall through the rockers: fascinating stuff no matter what your age or math level is.
via The Math Kid.
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