we are surrounded by them.
we could not live without them.

but, do we have an idea of what they are, and how they do what they do?
searching, i found this, that was very enlightening.
i hope it will be to you too.
or at least add something to what you already knew:
https://www.explainthatstuff.com/how...storswork.html

and more:
https://www.google.ca/search?hl=en&s....0.BWgAHStZAsM


enjoy!