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Restrictions Are Slowing Coronavirus Infections, New Data Suggest

A Different Way to Chart the Spread of Coronavirus

No More Than 10 People in One Place, Trump Said. But Why?

Dr. John Hansen, Who Made Marrow Transplants Safer, Dies at 76

Wary of Chinese Espionage, Houston Cancer Center Chose to Fire 3 Scientists

Abnormal Levels of a Protein Linked to C.T.E. Found in N.F.L Players’ Brains, Study Shows

W.H.O. Panel Demands a Registry for Human Gene Editing

E-Cigarettes Are Effective at Helping Smokers Quit, a Study Says

Why It Hurts to Lose Sleep

Study Shows Big Rise in Teen Vaping This Year

Fetal Tissue Research Is Curtailed by Trump Administration

Microplastics Find Their Way Into Your Gut, a Pilot Study Finds

Harvard Calls for Retraction of Dozens of Studies by Noted Cardiologist

Not All Women Have a Clear Answer for How Sexual Assault Affected Them. That Doesn’t Mean It Had No Effect.

The Couple Who Helped Decode Dyslexia

A Battle Plan for a War on Rare Diseases

How Much Alcohol Is Safe? None, Say These Researchers

3D Color X-rays Could Help Spot Deadly Disease Without Surgery

Psychology Itself Is Under Scrutiny

How Many Teenage Girls Deliberately Harm Themselves? Nearly 1 in 4, Survey Finds.