Newton's Cradle Desk Toy
The classic five-ball Newton's cradle: steel balls on strings between chrome rails, on a black base, about 5.7 inches each way. No batteries. Sold on Amazon by QLKUNLA.
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If someone asks for a Newton's cradle, give them one before getting clever. Lift one ball, let go, and the ball on the far end jumps; lift two and two jump. It is a physics demonstration that has lived on desks since the 1960s because the click is satisfying and the motion runs on its own for a while. This is the standard small size, so it fits beside a keyboard. About $20.
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