When Andrés Ruzo was just a small boy, his grandfather in Peru told him a story with an odd detail: There is a river, deep in the Amazon, that boils. Years later, he resolved to find it — and find out what’s going on — and headed to the jungle.
Oncologist and Pulitzer Prize-winner Siddhartha Mukherjee explains why doctors aren’t so much looking for disease as bias in their work.