Differences between the iPad 2 and the iPad 3

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The popularity of the iPad is not new, but the great number of iPad 3 sold in the last months is reaching out to its predecesor. The differences between consecutive versions of gadgets produced by the same company (any big company in the world) has been used many time to present and promote the new products. I was made curious about the iPad a few days ago and I am asking you think I should buy one or not.