Thank you very much to the author for interesting selections. You can look at this for a long time. It is very pleasant to work with such equipment, and the result is pleasant. Of course, the engineering thought of man is amazing - such machines first need to be invented, and then made. I wonder if there is anything similar in nature? For example, a cow eats grass, and gives milk. Or a bee drinks nectar, and gives honey. It turns out that if someone invented and made machines, then living creations with such amazing abilities, someone also had to think up and make?!