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Trump Travel Restrictions Bar Residents Needed at U.S. Hospitals

Regulators Approve a Twice-Yearly Shot to Prevent H.I.V. Infection

Real Risk to Youth Mental Health Is ‘Addictive Use,’ Not Screen Time Alone, Study Finds

When Humans Learned to Live Everywhere

Why a Vaccine Expert Left the C.D.C.: ‘Americans Are Going to Die’

Elon Musk’s AI Company Faces Lawsuit Over Gas-Burning Turbines

Is Fake Grass Safe? A Manufacturer Sues to Stop a Discussion.

A Traveler Waits in the Stars for Those Willing to Learn How to Look

South Africa Built a Medical Research Powerhouse. Trump Cuts Have Demolished It.

Trump’s Cuts to N.I.H. Grants Are Illegal, Federal Judge Rules