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On 28 March 2016, YouTube user Roman UrsuHack uploaded a video seemingly showing a glass jar being cut using nothing but water, oil, and heat: The video gained hundreds of thousands of views in the weeks after its initial posting and left many viewers wondering whether they had witnessed something within the realm of physics or just fallen for a clever video hoax. The video issued from a rather reliable source: the Roman UrsuHack YouTube channel traffics in clever do-it-yourself craft projects, such as making periscopes, homemade cookie cutters, or custom shaped spoons: While it's possible that Roman slipped a fake video into his channel, that switcheroo would likely do more harm to his brand than good. And the principles illustrated in his video have been similarly showcased elsewhere on YouTube: Since oil is less dense than water, it floats to the top of the bowl and creates a ring around the glass jar. Roman apparently then heated this ring of oil to a temperature high enough to crack the glass. Skeptics have argued that the thin piece of metal used by Roman shouldn't have been able to conduct enough heat to cut the glass. While this may be true, it was noted in the description which accompanied the video that people trying the experiment at home may need to use a larger piece of metal:
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