In 2000, the US Centers for Disease Control (CDC) carried out a secret mission to bury, skew, and manipulate data in six vaccine safety studies, in a coordinated effort to control the message that "vaccines do not cause autism." They did so via secret meetings and backtesting health-care data. The CDC invested tens of millions of dollars in a foreign health-care data analytics startup run by Danish scientist Poul Thorsen, a move to ensure that no link ever surfaced. But fate had other ideas. The agency soon...