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Tansplanted testicular tissue grew sperm in an infertile patient

The history of testicular transplants is long and often sordid, but this successful procedure offers hope for survivors of cancer and other diseases that affect fertility

Why don’t insects live in the ocean?

Nobody knows why insects aren't found living in the ocean. Scientists just eliminated one theory

Why environmental groups are suing over SpaceX’s land swap deal

If approved, this deal would give SpaceX hundreds of acres that are currently part of the Lower Rio Grande Valley National Wildlife Refuge in exchange for private land

Ancient geology could insulate Iran's nuclear centrifuges under Pickaxe Mountain from bombing

Iran's Pickaxe Mountain, or Kuh-e Kolang Gaz La in Persian, is part of a volcanic arc that formed tens of millions of years ago and is made of a tough-to-penetrate rock

Health Care Agency Discontinues Dozens of Active Research Awards

KATRINA MILLER

The Agency for Healthcare Research and Quality slowed the awarding of new grants last year. Now it is stopping existing ones.

Saudis Reach Deal With U.S. That Could Let Them Enrich Nuclear Fuel

DAVID E. SANGER, EDWARD WONG AND WILLIAM J. BROAD

U.S. lawmakers and Israeli officials have expressed opposition to such a plan, to be announced Wednesday, fearing that the kingdom could use a civilian nuclear project to develop nuclear weapons.

What to Know About Peptides the FDA Is Considering for Use

DANA G. SMITH

The agency is considering whether compounding pharmacies should be allowed to produce BPC-157, TB-500 and other previously banned peptides.

Jackie, Bald Eagle and Webcam Star, Is Recovering After an Attack in California

ALEXANDRA E. PETRI

Jackie found an online audience through a webcam pointed at her nest in California. She was rescued last week after a fight with other eagles, officials said.

Can This New Enzyme Turn Back the Clock in Bodily Tissues?

K. R. CALLAWAY

In a recent study, scientists devised a way of reversing the buildup of compounds that lead to some age-related diseases.

How lost shipping containers helped map the world’s ocean currents

Thousands of shipping containers vanish every year—what becomes of them?

Is it possible to regain a sense of smell? These scientists are working on it

Smell is one of the most complex and least understood senses

The Rubin Observatory’s greatest legacy will be this ‘movie’ of the sky

Using the new Vera C. Rubin Observatory, astronomers are beginning the largest and deepest survey of the sky. What will they see?

Sunlight benefits and risks: what science says about healthy sun exposure

Could sunlight actually improve your health? New research suggests we may need to rethink total sun avoidance

How a 99-year-old mathematician unraveled a century-old braid mystery

Joan Birman popularized the Burau representation problem decades ago. Now she and two colleagues have a proof that reveals brand new insights into the geometry of braids

Life of Alan Turing Emerges in Richer Detail From Short Story

CLAIRE MOSES

A Cambridge professor has transcribed a handwritten story that the famous mathematician wrote in the year before his death, presenting a different side of him.