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Einstein is a pack in the Poptropica Store which you can buy for 75 credits. It includes two items - a book called Who Was Albert Einstein? and a costume to customize so you could look like Albert Einstein. It came out to commemorate the 57th anniversary of Albert Einstein's Birthday. When you press the space bar, his world-famous equation, E=mc2 comes out in a thought bubble. You can read a chapter of the book.