Hop on over to Amazon where you can score Newton’s Cradle Balance Balls Only $8.55 Shipped on Amazon (Regularly $18.99) when you use promo code TRWZGWOL at checkout.

Watch as one ball on one end strikes the other sending the one on the opposite end into the air while the ones in the middle stay perfectly still. Lift one of the ball bearings and let it swing into the others. Watch the one at the opposite end swing away.

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