What is this picture?

Question

What is shown in this image?

Accepted Answer

dragonfly wing (macro). Dragonfly Wings: Nature's Nano-Engineers Dragonfly wings are covered in microscopic bumps and ridges that create an invisible armor—these nanostructures actually kill bacteria and fungi on contact without any toxins, making them self-cleaning and naturally antimicrobial. Scientists are now copying this design to create hospital surfaces and medical devices that could fight infections without antibiotics.

Answer: dragonfly wing (macro)