The 2,400-year search for the atom - Theresa Doud

View full lesson: http://ed.ted.com/lessons/the-2-400-y... How do we know what matter is made of? The quest for the atom has been a long one, beginning 2,400 years ago with the work of a Greek philosopher and later continued by a Quaker and a few Nobel Prize-winning scientists. Theresa Doud details the history of atomic theory. Lesson by Theresa Doud, animation by TED-Ed.