Next to a cacophonous building site, where Indian labourers and engineers are working alongside international consultants to build a new station for Delhi’s world-class metro, stands one of the grimy glass-and-concrete office blocks ubiquitous in urban India. But up its staircase, past the workspaces of outsourcers and traders and accountants, you’ll find an unexpected concern: a dial-in health clinic whose care is based on the thinking of a man who lived roughly 2,000 years ago.