Alexandra Sifferlin, a health and science editor for Times Opinion, hosted an online conversation on Wednesday with the Opinion columnist Zeynep Tufekci and the Opinion writers David Wallace-Wells and Jessica Grose about Robert F. Kennedy Jr.’s first of two confirmation hearings for secretary of health and human services.

The Kennedy scion is already well-known for pushing conspiracy theories and junk science, but Wednesday’s hearing revealed just how little he understands about the monumental job he might take on.

If confirmed by the Senate to be the nation’s health secretary, Robert F. Kennedy Jr. would have vast powers over immunization policies for children and adults.

Kennedy is the country's most well-known anti-vaccine activist, and could soon lead be Trump's top health official.

Robert F. Kennedy Jr.’s frequent questioning of the safety of childhood vaccinations over the years is persisting as an issue in his confirmation hearings to become the Trump administration's top health official.

Robert F. Kennedy Jr. is an environmental lawyer, author and political activist who has suspended his independent presidential campaign and thrown his support behind former President Donald J.

Robert F. Kennedy Jr. has said vaccines are not safe. His support for abortion access has made conservatives uncomfortable. And farmers across the Midwest are nervous over his talk of banning corn syrup and pesticides from America’s food supply.

WASHINGTON (AP) — Robert F. Kennedy Jr. has said vaccines are not safe ... which has the power to enact restrictions. “We’d be pinched out. It would devastate rural, Midwest communities ...