How Do Gliders Work?

In the case of biological systems like birds, humans, et cetera, we have an 80 p cycle that produces energy in our bodies. So yes, birds do o use energy. They use fuelor without fuif if you starve a bird, it won't fly. It will lose energy. That's the biology behind it. Is it possible to engineer an aircraft without any kind of fuel? You have gliders. Let me show you what a glider looks like. Yis or let's tak a look at gliders on second. These are various kinds of gliders. And these aircraft glide. They don't have any any any motor and they don't take any