The Word That Makes 55% of People Yawn When They Read It | Reader's Digest
Why Do We Yawn + Are Yawns Really Contagious? - Casper Blog
Yawning - The surprising details behind a yawn | HuffPost Contributor
Is it Normal to Yawn Excessively? | WR Mattress
Why do we yawn? | New Scientist
Why Do We Yawn and Why Is It Contagious? | Science| Smithsonian Magazine
Yawning doesn't catch on in babies › News in Science (ABC Science)
Why Do We Yawn? - The New York Times
Why Do We Yawn When We're Sleepy? Everything You Should Know
A simple slice of science - Why do we yawn? - Dr. How's Science Wows
Why do we yawn? Scientists are still searching for the answer
What happens in the brain to make us 'catch' yawns - BBC News
Why do we yawn? | Library of Congress
Why Do We Yawn + Are Yawns Really Contagious? - Casper Blog
Yawns Are Cool · Frontiers for Young Minds
Women are twice as likely to yawn as men - this is why - Mirror Online
Why Is Yawning Contagious? | Mental Floss
Why Yawning Is Contagious | Time
Why we yawn and What it means
Yawn - Wikipedia
Yawn - Wikipedia
Is yawning a tool for wakefulness or for sleep?
Open wide: why yawning reveals much about your level of empathy | Life and style | The Guardian
