How many of your Facebook friends do you think you know? Would you help a stranger in need? Do you know why you're so in love with your new smartphone? The truth is: you're probably wrong. You are not so smart. In this international bestseller, award-winning journalist David McRaney examines the assorted ways we mislead ourselves every single day. A psychology course with all the boring bits taken out, prepare for a whirlwind tour of the latest research in the subject, fused with a healthy dose of humour and wit. You'll discover just how irrational you really are, which delusions keep you sane, how to boost your productivity, and why you've never kept a New Year's resolution.