A cancer doctor on losing his wife to cancer.

Can an illegal drug heal PTSD?

Some passions are more dangerous than others.

Policing the world of experimental research in the age of TED talks and Freakonomics.

How the world failed on climate change.

Twelve years ago, Michael Stewart killed his mother during a psychotic episode. How he and his family are coping today.

The scientists working to free those trapped between life and death.

Do jellyfish have minds?

A diagnosis in question.

“That educated women’s eggs are in demand is one thing, that they are willing to provide them is another.”

Following the hunters and poachers, servers and saviors of the little-known pangolin—a scaly, endangered creature sold by the thousands on the black market.

Bonobos are celebrated as peace-loving, matriarchal, and sexually liberated. Are they?

Over the last several years, millions of dollars worth of antique rhino horns have been stolen form collections around the world. The only thing more unusual than the crimes is the theory about who is responsible: A handful of families from rural Ireland known as the Rathkeale Rovers.

Watching a brain surgeon at work.

On the experience of having a stroke.

“With the rise of factory farming, milk is now a most unnatural operation.”

Why we love repetition in music.

Inside BuzzFeed’s adorable animal machine.

The author gets a crash course in health care pricing after having his urethra fixed.

“Too much is being asked of the Delta.”

An audacious plan to create a new energy source could save the planet from catastrophe. But time is running out.

How warming and acidifying oceans endanger the entire marine food chain.

“If we do nothing, we’re dead! We’re toast!”

The neurologist explores the mystery of hallucinations.

Humans play. So do animals. Perhaps that’s why we’re all here.