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MacBarnettistheauthorofseveralpicturebooks,including"BillyTwittersandHisBlueWhaleProblem","GuessAgain!",and"OhNo!:OrHowMyScienceProjectDestroyedtheWorld".HealsowritestheBrixtonBrothersseriesofmysteries.MacisthefounderoftheEchoParkTimeTravelMart,aconveniencestorefortimetravelers,andservesontheboardof826LA,anonprofitwritingandtutoringcenter.
