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WELCOME TO THE 4th DIMENSION!

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According to Einstein, you need to describe where you are not only in three-dimensional space* — length, width and height — but also in time.

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Time is the fourth dimension. So to know where you are, you have to know what time it is.

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Your complete answer should be "I'm sitting on a 4-foot-high aardvark at the northeast corner of Bern St. and Ulm St., and it's July 1st, 2002, at 1:23 p.m. on my watch." Einstein called a description that used four dimensions an event.

*By "space," we mean the space that is all around us, not just outer space.

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Image Credits:

Kid photos: courtesy of Denis Finnin, AMNH; It's All Relative: Jim Paillot; Rabbit, elephant, and ant: Francesco Santalacia; You Light Up My Life!: Cathy Sanchez Duvivier