http://htwins.net/scale2/
This site is wicked cool, allowing one to zoom all the way out to the estimated size of the universe, and all the way down to quantum foam and strings. In between is a vast assortment of things of various sizes, all placed at their appropriate size in the scale, and each with its own description.
Enjoy learning about the universe around us, we're a part of, and we're made of!
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