questionswhat is a good way to play with a slinky?

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You could try the palms-up hand-to-hand trick.

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Stacks of books, step stool, chair, upside down bowls. Think Rube Goldberg set ups.

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Set it up in the hallway to show the difference between compression waves and transverse waves.
A career in engineering or seismology will await.

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Put it on a treadmill, it will go forever dancing from side to side as it goes if you get the treadmill speed correct.