Top F.D.A. Official Resigns Under Pressure

After turning down several new drugs and restricting use of another, Dr. Vinay Prasad drew the ire of the right-wing influencer Laura Loomer and others.

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Drugmakers Notch a $5 Billion Win in Republicans’ Policy Bill

More medicines will be spared from Medicare price negotiations, a change that is projected to wipe out billions in savings for the federal government.

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Trump’s Billion-Dollar Tech Deals, and a Military Buildup at the Border

Plus, your Friday news quiz.

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Drugs Have Uses We Can’t Imagine. He’s Using A.I. to Find Them.

Scientists are using machine learning to find new treatments among thousands of old medicines.

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What Is Hantavirus, the Rare Disease That Killed Betsy Arakawa?

Ms. Arakawa, the wife of the actor Gene Hackman, died from the effects of a disease often caused by contact with droppings from infected rodents.

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2 Deaths in New York Linked to Bat Feces Used as Cannabis Fertilizer

Two men in Rochester, N.Y., died after being infected with a rare fungus found in bat feces, which is sometimes used as fertilizer, researchers wrote in a medical journal.

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