How History Speaks on Instagram: "What looks like a simple marble toy is actually a 700-year-old mathematical idea in motion. This device demonstrates the Tusi Couple, where two perfectly synchronized circular motions combine to create a straight-line path. Invented by 13th-century Persian scholar Nasir al-Din al-Tusi, this principle was once used to explain planetary motion in astronomy. The steel balls only appear to move straight, but their path is the result of pure geometry cancelling curve
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worldEdify™🌍 on Instagram: "What looks like a simple marble toy is actually a 700-year-old mathematical concept in action. This device demonstrates the Tusi Couple, where two perfectly synchronized circular motions combine to produce a straight-line path. Invented by 13th-century Persian scholar Nasir al-Din al-Tusi, it was originally used to explain planetary motion in astronomy. The steel balls only appear to move in a straight line, but their motion results from pure geometry canceling curve
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