eli5 How do scientists make microscopic machines and nano bots?

Question

For example I just saw an image from an electron microscope that showed a nano injector used to inject dna into a single cell.

And the machine looked highly engineered and obviously man-made with crisp and elegant structures. But it is small as heck. It’s insane

In: 3

Answer 1

It seems that they use a chemical that eats stuff when exposed to light, then put it in a dark box with a projector to “sculpt” it.