What will we lose when Najin and Fatu die?

As vaccines roll out, the U.S. will face a choice about what to learn and what to forget.

Could shrunken heads from the Amazon hold the key to curing cancer? One man thought so—and spent a lifetime trying to prove it.

A cloud enthusiast becomes an advocate for a new type of cloud.

Evidence of the failure to love is everywhere around us. To contemplate what it is to love today brings us up against reefs of darkness and walls of despair.

Genetic analysis of human remains found in the Himalayas has raised baffling questions about who these people were and why they were there.

Climate change is propelling enormous human migrations as it transforms global agriculture and remakes the world order — and no country stands to gain more than Russia.

How toxic fumes seep into the air you breathe on planes.

And what it lost in the process.

California’s redwoods, sequoias and Joshua trees define the American West and nature’s resilience through the ages. Wildfires this year were their deadliest test.

A growing body of research suggests that trees can communicate and cooperate in the wild.

The Canadian scapegoat of the AIDS epidemic.

He’s an expert on Twitter virality, but not on infectious disease. Does he do more help or harm?

Prenatal testing is changing who gets born and who doesn’t. This is just the beginning.

The pandemic comes to Star City, the secretive home of Russia’s space program.

For a few days in 1995, many Indians believed a religious idol had developed a lifelike ability to drink milk.

Dutch astronomer, mathematician, and inventor Christiaan Huygens’ early work on probability paved the way for his very modern evaluation of what alien life might look like.

A trip to one of America’s quietest places and the guy who has dedicated his life to keeping it that way.

Data is the lifeblood of a functioning government. Over the past four years, the Trump administration has destroyed, disappeared, or distorted vast swaths of the information the state needs to protect the vulnerable, safeguard our health, and alert us to emerging crises.

How the waters off of LA became a DDT dumping ground.

The rare Chilean soapbark tree produces compounds that can boost the body’s reaction to vaccines.

“Uncertainty, it has been shown, is more painful than certain physical pain.”

In Gujarat, India, a special breed of camel is not constrained by land—but cannot escape the many forces of change.

Millions of human artifacts circle the Earth. Can we clean them up before they cause a disaster?