While the title sounds like an April Fool's Day prank, this optical trick is real. If you put polished glass in an oil bath, it become completely invisible. So a marble run built of glass with a glass marble, submerged in oil, with some visible elements, gives us an eerie experience. The video is in Japanese, but you can turn on English subtitles. -via Geeks Are Sexy
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So very cool to watch, and very calming to hear the researcher's voice. Perfect when watching an invisible marble.
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neat
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