HHS Secretary Robert F. Kennedy Jr. was on The Tucker Carlson Show last week. It got me to thinking: What's next in RFK Jr.'s crusade against vaccines after he turned ACIP into an antivax committee?

FDA approval of the COVID-19 vaccines, then, could spur more people to get vaccinated, potentially driving the U.S. ever closer to its herd immunity threshold: when as much as 80 percent of the ...