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Why is yawning contagious? - Claudia Aguirre

Adults Human
*Yaaawwwwwn* Did just reading the word make you feel like yawning yourself? Known as contagious yawning, the reasons behind this phenomenon have been attributed to both the physiological and psychological. It's been observed in children as young as four and even in dogs! Claudia Aguirre visits the many intriguing theories that might explain contagious yawning.

Do your organs grow with you?

Adults Human
This week, Jen Alexander asks, "Do your organs grow with you?"

How Many Smells Can You Smell?

Adults Human
How do we smell?

How a wound heals itself

Adults Human
Our skin is the largest organ in our bodies, with a surface area of about 20 square feet in adults. When we are cut or wounded, our skin begins to repair itself through a complex, well-coordinated process. Sarthak Sinha takes us past the epidermis and into the dermis to investigate this regenerative response.

Why Am I Tired?

Adults Human
Why do we feel so tired all the time? Hannah Fry looks at the reasons modern life might be exhausting us, from irregular bedtimes to blue lights from our phones.

Why Your Brain Is In Your Head

Adults Human
Have you ever wondered why the brain is located where it is?

Why Music Moves Us

Adults Human
Why does music make us feel happy or sad? Or angry or romantic? How can simple sound waves cause so much emotion? I went from my comfy chair to the streets of Austin to investigate how it might be written into our neuroscience and evolution. Modern neuroscience says our brains may be wired to pick certain emotions out of music because they remind us of how people move!

When The Lion Sees Its Rescuer

Adults Human
Lions aren't that cruel. They know how to show their gratitude.

This Girl Befriends A Dangerous Moray Eel

Adults Human
This unlikely friendship is really amazing.

GoPro: Diver Saves Sea Turtle

Adults Human
Divers off the coast of Mexico save a sea turtle that became tangled in rope.

How Much Sleep Do You Actually Need?

Adults Human
If you get too little, or too much, your brain could suffer.

Watch This Smart Crow Ask Human For A Drink

Adults Human
Thirsty crow comes to humans for help

Jumpy

Adults Human
Jumpy, a Border Collie and Blue Heeler mix, has been training with his owner Omar von Muller ever since he was a puppy. In this video, he's demonstrating the famous "Skidboot" routine.

Usain Bolt vs. a Cheetah

Adults Human
The fastest man alive, Usain Bolt, runs a virtual race against nature's fastest land animal.

Why do we cry? The three types of tears

Adults Human
Whether we cry during a sad movie, while chopping onions, or completely involuntarily, our eyes are constantly producing tears. Alex Gendler tracks a particularly watery day in the life of Iris (the iris) as she cycles through basal, reflex and emotional tears.

Why Do We Yawn?

Adults Human
What makes yawning so contagious?

How sugar affects the brain

Adults Human
When you eat something loaded with sugar, your taste buds, your gut and your brain all take notice. This activation of your reward system is not unlike how bodies process addictive substances such as alcohol or nicotine -- an overload of sugar spikes dopamine levels and leaves you craving more. Nicole Avena explains why sweets and treats should be enjoyed in moderation.