Mercury Maze: metal mercury (Hg) is liquid at room temperature, and it has very strong surface-tension which causes small blobs of it roll in a peculiar way. The curious properties of elemental mercury are showcased in this vintage toy from the 1980s. Mercury is very toxic and toys like this are now banned in most countries. Mostly dangerous if the toy were to break open- contact with the skin and breathing vapors are to be avoided with mercury.
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