Where did English come from?

Claire Bowern traces the language from the present day back to its ancient roots, showing how English has evolved through generations of speakers.

Why do women have periods?

A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle.

How stress affects your body?

Sharon Horesh Bergquist gives us a look at what goes on inside our body when we are chronically stressed.

What is depression?

Depression is the leading cause of disability in the world; in the United States, close to ten percent of , ...

Why do we dream?

Amy Adkins reveals the top seven reasons why we might dream.

What is Alzheimer's disease?

Alzheimer's disease is the most common cause of dementia, affecting over 40 million people worldwide.

What is dyslexia?

Dyslexia affects up to 1 in 5 people, but the experience of dyslexia isn't always the same.

Why do we cry? The three types of tears

Whether we cry during a sad movie, while chopping onions, or completely involuntarily, ...

What are weather fronts?

In this video, James Chubb explains what weather fronts are and the kinds of weather they bring.

How do tornadoes form?

Tornadoes are the most violent storms on Earth, with wind velocities that can exceed 200 miles per hour.