How Small an Atom can be

I found very interesting facts on the video and suggest you to  the link to refresh your knowledge to the latest.

Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of the building blocks that make our world.