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When the twins earn a trip to Bird Land Amusement Park, they discover that some charities do more harm than good. With help from friends, they must learn to give better—before the park shuts down forever!
When the Tuttle family debates buying a fancy new fridge, the twins meet John Maynard Keynes, Saifedean Ammous, and a world of quirky food. Together, they discover the hidden risks of melting money and thinking only in the short term.