Metals: physics, chemistry, history

Can we do without metals in everyday life? Imagine they suddenly disappeared - there would be no cars, trains, machines, or even the most ordinary knife and screwdriver! If metals completely vanished, our planet itself would cease to exist: where... its iron core is, there would be emptiness. The magnetic field created by the core would disappear, and there would be no one to protect us from cosmic radiation.And a person couldn't survive a second without metals. Without calcium, teeth and bones would crumble to powder; without iron, blood would stop transporting oxygen throughout the body, and without magnesium, plants would stop releasing that oxygen.Of course, a small book cannot cover everything about metals and their characteristics. But it is quite clear: modern humans cannot do without knowledge of metals!