A Hopeless Diagnosis? Not for This Patient

Through sheer determination, Neena Nizar has become the first patient in a clinical trial testing a treatment for her disease — one so rare it affects just 30 people worldwide.

By Gina Kolata

6 Exercises Physical Therapists Wish Everyone Did to Age Well

Try these simple movements to stay strong and limber.

By Danielle Friedman

Welcome to Needle Nation

Weight-loss drugs, peptides, I.V.F. As sharps migrate out of doctors’ offices, even needle-phobics are willing to embrace shots.

By Liz Krieger

Jaguars Are Ready to Come Back. The Border Wall Might Stop Them.

A lone male roves the Arizona mountains, and a female has been spotted just across the border in Mexico. The sightings raise hopes for the species, despite serious threats.

By Douglas Main and Celia Talbot Tobin

This Pesticide May Be Too Dangerous to Use. Farmers Say They Need It.

California announced that it’s phasing out paraquat, a pesticide widely used in the United States that is linked to Parkinson’s disease.

By Ted Alcorn

NASA Astronaut Whose Health Scare Led to I.S.S. Evacuation Has Retired

Mike Fincke spent 549 days in space across four missions, the fourth most time of any NASA astronaut.

By Adeel Hassan

Lost Science

She Studied Ways to Make People Smarter

Jessica Cantlon had a grant with the U.S. Navy to explore whether people could improve spatial problem-solving skills through training. Then the program was cut.

By Sachi Kitajima Mulkey

Why Europe Keeps Being Pummeled by Heat Waves

The whole planet is warming, but changes in weather patterns could help explain why the continent is suffering so many bouts of severe heat.

By Raymond Zhong

This Year’s El Niño Is Huge and Already Changing the World

The recurring climate phenomenon is expected to peak later this year, but it is already causing dry spells and crop failures on three continents.

By Raymond Zhong and Chico Harlan

Trump Administration Kills a Flagship Annual Report on the Arctic

The top of the world is warming faster than any other region. For 20 years, the Arctic Report Card chronicled the extraordinary transformation.

By Raymond Zhong

How Louisiana’s New Surgeon General Wants to Transform Public Health

Dr. Evelyn Griffin is pushing for more emphasis on wellness and prevention. She has also aligned with the MAHA movement in fighting government mandates and questioning the safety of some vaccines.

By Rosemary Westwood

Should the M.M.R. Vaccine Be Split Into Three Separate Shots?

President Trump is calling for immunizations for measles, mumps and rubella to be given in individual jabs in three different appointments instead of the standard combination shot.

By Apoorva Mandavilli

A City Mobilizes Against a Stubborn Health Threat: Mosquitoes

The city of Belém in northern Brazil was overwhelmed by an outbreak of dengue two years ago. An all-out municipal effort has reduced cases and may offer lessons to American cities.

By Apoorva Mandavilli and Alessandro Falco

How Cyclospora Evaded the U.S. Food Safety System to Sicken Thousands

The Trump administration delayed a rule last year that could have sped up the effort to pinpoint the source of the contamination. Critics charge that food safety oversight has eroded overall.

By Christina Jewett and Julie Creswell