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In a video address, the health secretary said the United States would no longer donate to Gavi, the vaccine agency. The organization rejected his claims.

The panelists will review measles vaccine recommendations and discuss a preservative that the health secretary has falsely claimed causes autism.

David Keeling would take over the workplace-safety agency just as it is considering rules to protect against extreme heat. His former employers, UPS and Amazon, have opposed the rules.

Hints of a more skeptical approach to immunizations have already surfaced.

The administration has gutted agencies like U.S.A.I.D., and President Trump has denigrated their work as wasteful and rife with fraud. His views on humanitarian assistance have seesawed since he entered political life.

The fourth mission by the company Axiom Space will help the three countries get to the International Space Station for the first time.

The Vermont Green Football Club champions environmental work and draws sold-out crowds, with the help of free ice cream.

The European wood pigeon helped me appreciate its omnipresent city cousins.

Scenes of nebulas in the Milky Way, a cluster of galaxies and thousands of new asteroids are a teaser of how the U.S.-funded observatory on a mountain in Chile will transform astronomy.

The Vera C. Rubin Observatory is expected to find millions of unknown objects in our solar system, and perhaps even a mysterious Planet Nine.