When is the work of two people together greater than what either could do on their own? As long as we’ve been interested in creativity, we’ve been preoccupied by the myth of the lone genius. Shenk busts this fantasy apart and draws on new scientific research to show how the pair is the embodiment of ingenuity. Shenk explains how synergy created the magic of John Lennon and Paul McCartney, the hilarity of Trey Parker and Matt Stone – and the startup savvy of Sheryl Sandberg & Mark Zuckerberg, Sergey Brin & Larry Page, Steve Jobs & Steve Wozniak and the genius of scores of others in the fields of writing, music, dance, science, technology, social activism, and business. When it comes to creative success, Shenk persuasively argues that two is the magic number – and understanding why changes everything we thought we knew about creativity.