This is a transmission electron microscopy image of a cross section of a fibroblast (1) interacting with a single nanofiber (2): N -- nucleus, er -- endoplasmic reticulum. Disclaimer: AAAS and ...

With the inventions of transmission electron microscopy (TEM) in 1931 and scanning electron microscopy (SEM) shortly after in 1937, scientists gained an unprecedented ultrastructural view of the ...

This is a genuine image of a cross section of grass leaf under a microscope. No part of the leaf is "smiling" in any literal sense, of course, but the round features known as "vascular bundles" do ...