Health
Why We Yawn — and Why You Just Yawned Reading This
Science still argues about what yawning is for. The leading answer involves cooling your brain — and why it spreads is stranger still.
Health
Body, mind & how to live well
Health
Why Do We Dream? What Science Actually Knows About the Sleeping Brain
What the leading theories say about dreaming — from memory filing to emotional rehearsal — and what still remains a genuine scientific mystery.