They refer to it as a “happy accident”. Chemists Shankar Balasubramanian, 54, and David Klenerman, 61, weren’t trying to change the world when they met at Cambridge’s Panton Arms pub in August 1997. With sequencing so quick and cheap, the hope, says Klenerman in the video, is that “if you’ve been sequenced, you’ll know which diseases you’re predisposed to getting.” …