We may receive a commission on purchases made from links. Ah, USB; where would we be without it? Introduced in the late 1990s as a one-size-fits-all replacement for the handful of ports and ...

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An iron nail is placed in a solution of blue copper(II) sulfate. Over time, a brown solid appears and the solution becomes colourless. This is because copper and a solution of iron(II) sulfate forms.