Health and Human Services Secretary Robert F. Kennedy Jr. plans to investigate climate and weather control, an idea gaining traction as an updated twist on a fringe theory linking airplane vapor trails, or contrails, to toxic substances that poison people.

Kennedy is expected to create a task force to recommend possible federal action, according to a former agency official, an internal agency memo obtained by KFF Health News, and a consultant who says he helped with the memo.

“HHS does not comment on future or potential policy decisions and task forces,” agency spokesperson Emily Hilliard said by email.

The plans show how rumors and conspiracy theories can gain an air of legitimacy under the Trump administration, where researchers say that unscientific ideas have unusual power to take h

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