How our idea of the atom changed over about 2400 years: from a guess about tiny uncuttable pieces to quarks, spin and force carriers. Pick a bar to explore each model.
Faded ends mean the date is approximate. An arrow means the idea is still used today. Overlapping bars show a new model arriving while an older one is still in use. Use Tab and Enter to pick a bar.
Select a bar in the timeline to open its story, simulation and sources.