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University of Kansas: Quarked!: How Tall Are You?
Enter your height using inches or meters, and see how tall you are in units, from as tall as the Statue of Liberty and an elephant, down to atoms and quarks. Next, see if you can put the Quarkster characters and yourself in order by height.
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University of Kansas: Quarked!: Ushi's Ruler Game
See how many times a paper ruler must be cut in half before it reaches the size of a quark.