An impressive physics demonstration.
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[...] This cool science demonstration shows a light “boat” floating on a sea of sulfur hexafluoride gas. The gas is significantly denser than the surrounding air, but still transparent, so it looks like a magic trick. This experiment might not be as easy to do as our last article about non-newtonian fluids, although you can apparently get sulfur hexafluoride for as little as $10 a pound. If you do get your hands on some, the floating on thin air tick is just one fun thing to do with it. [...]