Look at all the things around you—your computer, your finger, your desk, even the trees outside. They're all made of atoms. They're so tiny, it would take billions of them just to dot the "i" in the word "atomic"! Atoms are made of even smaller parts: a central nucleus made of protons and neutrons, and electrons that circle around the atom in special patterns called orbitals.

Image credits: main image, © AMNH/ Eric Hamilton.