Tin is one of the earliest metals known.

It is the lightest metal known, yet very strong.

The product of this process was a white metal, known as finers metal and refined iron'.

Copper then was the only metal known to man for a long period of time.

Odds are, if you name any electronic device, it relies on a group of metals known as the rare earths.

Chimneys are usually made of metals known as polymetallic sulfides.

Cadmium, one of the most toxic metals known to man, should be used only where no satisfactory alternative exists.

Alloys of nearly every metal known have been encountered in jewellery.

Silver, although it is the least resistive metal known, has a high density and does poorly by this measure.

No amount of power could do that; no metal known could stand the strain, much less living beings inside them.