Yuri Ralchenko led one of the oldest teams at the National Institute for Standards and Technology. The fate of some experiments hangs in the air.

Blooms of yellowish-brown seaweed along the Equator are breaking records and defiling beaches, while a centuries-old patch farther north is disappearing.Mexican National Guard members during a sargassum seaweed cleanup event in Cancun, Mexico, in June.

The health secretary has walled himself off from government scientists and empowered fellow activists to pursue his vaccine agenda.Robert F. Kennedy Jr., the health secretary, conferring with Hannah Anderson, then one of his top advisers, during a hearing in May.

A researcher found that a Japanese pond frog is impervious to the stings of the northern giant hornet, even when it goes down the hatch.

The president said he would weaken Biden-era mileage standards, which were designed to increase electric-vehicle sales, calling them a “scam.”President Trump, surrounded by executives from the auto industry, in the Oval Office on Wednesday.