Geiger counter

A geiger counter is like a special toy that helps grown-ups measure how much invisible thingies that can be dangerous are around. When mommy or daddy turns it on, it uses a tiny piece of special metal to listen to tiny little pops coming from the invisible thingies that can hurt us, like X-rays or radioactive stuff.

The geiger counter counts how many of these pops happen in a certain amount of time and then shows the number on a screen. If the number is too big, that means there are too many invisible thingies around and they could make us sick or hurt us.

So, the geiger counter is like a magic toy that can help grown-ups stay safe by telling them when to be careful around certain things, like power plants or areas where someone spilled something radioactive.