SPOILER ALERT! This post contains details from Stranger Things 5 Volume 2. After nearly a decade, Stranger Things fans ...
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Endless bouncing balls

A physics demonstration shows how bouncing balls can appear to keep moving endlessly, explaining the energy transfer and motion behind the effect.
From a distance, shade balls look like a solid surface. But the moment weight is applied, physics takes over in a way that makes movement, balance, and escape far more difficult than expected.
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