Rocket science isn’t all that complicated; Newton pretty much covered it in four laws, and you can do it at home with half a bottle of water and a bicycle pump. The difference between that and the landing on the Moon is rocket engineering… now that can get a bit tricky.
If you have any interest in sci-fi you’re bound to have come across nanobots at some point: swarms of tiny machines that are invisible individually but come together in huge clouds to take on the shape of various objects or people. Sci-fi has predicted them for decades, and science edges closer and closer to catching up…but nature got there a long time ago. Inside our bodies are motors, pumps, springs, and levers made of just a handful of atoms. There are things that walk, climb, and swim around our bodies building and maintaining them. These are dwarfed by the huge factories that create them: the 10000000000000 or so cells in the average human body. We are the original nanobots.
If you keep seeing the same patterns appearing no matter how close you look at something, then it’s fractal. Like mountains, which look a lot like the rocks they’re covered in. Or trees, where each branch looks like a smaller tree with lots of even smaller trees sticking out of it, and even the leaves have their own tree pattern. Or a lake-shore, where the water finds smaller and smaller gaps to flow into, right down to microscopic cracks that look like giant valley’s if you look close enough. Fractals have some interesting properties, like having somewhere between 2 and 3 dimensions, or having infinite length and zero area.
Have you ever seen a an arrow flying in slow motion? They accelerate so fast that they are compressed and then spring back as if they are swimming. If they didn’t bend like this, they wouldn’t be able to go in a straight line.