With so much technology around us, some have argued that we're not using our brains as much as we could be - we use calculators for math and Google to access knowledge instantly and on the move.
American Express has come to the rescue with the launch of its free Cash IQ iPhone and iPod Touch app that helps you train your brain with four addictive and fun brainteasers, each with friendly bright graphics that stimulate the player to test their memory and mathematical skills.
Cash IQ also uses Facebook Connect to let players challenge their friends to see which of them has the highest Cash IQ.
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