How Rubba wanted to know what made danger for humans and creatures on the Earth

When Eraser and Rubba returned from their travelling in the deep, she looked at Eraser with some puzzlement. She wanted to know what was dangerous around, and what the most frightening was in the surrounding environment. She noticed that Eraser was afraid of some things, trying to keep off some unknown and aggressive ones.

“Of course, there are enemies, which can do harm, but the most dangerous among all of them are tiny, microscopic microbes, which can’t be seen without magnification,” Eraser fell into a deep thought. He wanted Rubba to understand him clearly, and he continued, “There are useful microbes, which help to produce food, for example. Do you know how bread is made, what makes compost in the garden, how they turn milk into cheese? Tiny living beings, called microbes (or micro-organisms), are responsible for all of these. Microbes are too small to see with our eyes, so we have to use a microscope to look at them. Bacteria, viruses and some fungi are all microbes.

Although you may think all microbes are hazardous, and cause diseases like colds or flu, most of them are actually harmless and some are even useful.

You want to know what microbes do harm; they are those, which destroy the body and make it a place for different diseases that may cause even death. So, all kids should wash their hands before eating and should not let the microbes inside their organisms.”

Rubba asked, “How do those microbes look like?”