A woman looking out a train window into the sunset with vitamin d pills approaching

How Does the Body Make Vitamin D from Sunlight?

A Curious Reader asks: How exactly does exposure to sunlight cause the the human body to synthesize Vitamin D3?
A woman with a protective mask in a plane

Do Airplanes Really Make You Sick?

A Curious Reader asks: Am I really at a higher risk of getting sick on an airplane?
A person saving a parking spot by laying down on the concrete.

When Did We Start Paying to Park Our Cars?

A Curious Reader asks: When and why did parking become monetized?
Hamlet. Poster for W. S. Hardy Company, 1894

When Did the Verb “To Be” Enter the English Language?

A Curious Reader asks: To be or naught to be?
Ancient Greek funerary naiskos

When Was the First Handshake?

A Curious Reader asks: When and how did the handshake originate?
A hand holding a sandwich

Why Do Americans Eat Three Meals a Day?

A Curious Reader asks: What’s the origin of the familiar breakfast-lunch-dinner triad?

Why Do Some People Have Curly Hair and Others Straight?

Either environmental or sexual selective pressure began acting on hair after humans began dispersing out of Africa.
What is health

What’s the Definition of Health?

The WHO’s definition has been the target of criticism in the medical literature since its first appearance in 1948.