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Do some brain training with the Einstein E=MC2 Metal Puzzles. The three mini metal puzzles are formed from Einstein’s iconic equation for mass-energy equivalence. You might not have grasped the complexities of the physics but everyone can have a shot at these brain teasers. Simply separate each puzzle into two pieces. How hard can that be…? Housed in an attractive gift box, full of images and facts about the famous genius, the E=MC2 Metal Puzzles will delight all puzzle fans. Metal Dimensions: H: 3cm x W: 20.5cm x D: 9cm