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Is mercury really a metal?

\High levels of pollutants such as mercury, other metals, pesticides and persistent organic pollutants can have a harmful effect on the immune system

We came fearfully close to the Sun's orbit because we launched from the wrong side of Mercury.

Pythagoras used to say that he had received as a gift from Mercury the perpetual transmigration of his soul, so that it was constantly transmigrating and passing into all sorts of plants or animals.