$42.94
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ScienceGeek DIY Pendulum Wave Classic 9 Steel Balls Newton's Cradle Balance Balls

$42.94
$85.88
toyboxtech
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Pendulum wave is simple pendulums,which together create a beautiful demonstration of synchronisation. After a minute or so of changing patterns the pendulums return to their original positions.It's physics,not magic.
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ScienceGeek DIY Pendulum Wave Classic 9 Steel Balls Newton's Cradle Balance Balls
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