The power of serendipity is hot in business circles. Silicon Valley campuses have been constructed to foster more “random collisions.” One key to creativity, many thinkers say, is unexpected interactions.  “Create spaces where you’re wandering around and exposing yourself to new people,” John Hagel of Deloitte’s Center for the Edge told me in an interview. And venture capitalist Anthony Tjan and his colleagues conducted an expansive survey of entrepreneurs that revealed a quarter of them self-identified as lucky and traced their success to embracing serendipitous encounters.