One thing to remember is that a virus is not a living organism.

Some contagious diseases are caused by bacteria, which can often move by themselves and which are of course alive.

A virus is not alive. It can’t move by itself.

The corona virus is simply a piece of RNA packed into a shield of fat, so part of what makes up genes, packed in a type of fat.

You can’t kill it, a molecule is not alive, but you can destroy the fat shield, which is done with soap or alcohol, because both destroys fat. 

Afterwards it is harmless for us.

You may have, chemically speaking again, parts of the stuff still floating around in your palm afterwards, but as long as there is nothing but RNA left of it, nothing happens to us. Without the fat it is not capable of infecting us or harming us.

If you wash your hands with soap and water, in addition to destroying it chemically, of course you rinse most of the stuff off your hands down into the sink. 

Soap works at least as good as alcohol for this, but in shops etc this is of course not practical. Both soap and alcohol work well.

There are also other corona viruses than this one. This is only one type, and a new one. 

They are so called because of the shape – they all look a little similar to a crown (corona in Latin).

Each of them act differently, give us slightly or very different diseases which need different cures. 

Normally, whenever you breathe out, a little moist, small drops of water, follows the breath out into the air.

But if you breathe slowly, not really much comes out.

If you talk, sing etc, there are usually more drops coming out, and of course if you sneeze or cough, a lot more.

There are bigger drops, which normally move faster and not so far, I guess naturally, they are heavier – and there are small ones, which sometimes spread and drift away slowly like a sort of mist. 

But sometimes the small ones go more like in a small «cloud», more collected, and in this case, they also behave more like the bigger drops, and land closer to you, on whatever object is there.

It is not established whether the virus is easiest transferred via the bigger or the smaller drops.

Also, one does not know yet if the direct contagion is the most important way, I mean directly from one person to another, or if the indirect ways, via physical objects, is how it spreads most easily or most often.

Even if the disease may spread to other organs in the body than the lungs etc, covid-19 is basically a respiratory infection. The virus may, rarely, come out via other body fluids etc, but the normal thing is that it comes through mouth and nose.