You could walk on mercury.

Element mercury (Hg), liquid form. By an unknown author cc3.0

Mercury is the only element that is liquid at room temperature and at room temperature, it has a density of 13.5 grams per cubic centimeter. The human body has a density of only 1 gram per cubic centimeter so you and anyone else would float on top of a pool of mercury. So would cannonballs and lead bullets, but not gold, which can be dissolved by mercury.


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