Quantum physics in a bouncing oil drop ?

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Changed the oil enough to see the occasional, and very welcome ball riding the oil surface, sometimes instantaneously, sometimes for seconds, and twice, have ran around the funnel a couple of times before scooting down the hole.
20cst, and silicon.
 

Astro14

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Always assumed it was just surface tension....had no idea that the reason was so subtle....
 
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