Heavy rainfall on the ground, with water droplets splashing back up

There’s a new acid in our rain — should we be worried?

Scientists and regulators are divided over the threat posed by rising levels of a chemical called TFA.

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Donald Trump stands at a podium speaking into a microphone, holding up some paperwork.

How Trump 2.0 is reshaping science

Since US President Donald Trump took office in January 2025, his team has made major changes to the federal government that have disrupted research and research institutions in the United States and beyond.
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