Imagine yourself a lifeguard on a beach. You are standing vigilant over your stretch of beach, ever watching for signs of a swimmer in trouble. What use are metals to you? Perhaps there is metal in the binoculars you carry. Metals are likely also present in parts of other gear you have, such as strap buckles, parts on megaphones, or the ring on your whistle. Of course, there are metals in your first aid kit. While metals play a smaller role in your rescue equipment, they still play an important role.
But what about you?
There you are in the hot sun all day long. What is protecting your skin from the sun’s rays? Your sunscreen could contain zinc-oxide. Of course, to be a healthy guard, able to respond quickly in an emergency, you will need to have proper levels of iron, zinc, copper, potassium, calcium, magnesium, and other metals in your body.
Metals are essential to health and an important part of rescue tools.
So metals are important to life guards, but what use are metals to Daleks?