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Topic: human body
Seven Million Years of Human Evolution
Scientists use fossils to reconstruct the evolutionary history of hominins—the group that includes modern humans, our immediate ancestors, and other extinct relatives. Today, our closest living relatives are chimpanze...
What’s the right way to wash your hands?
Handwashing is an easy and effective way to avoid catching the common cold or a seasonal flu. But not using enough soap or washing your hands too quickly might not get rid of all of the germs—bacteria, viruses, fungi,...
How do our eyes and brains work together?
How does an eye work? How do our brains try to interpret the information our eyes send them? And is seeing really believing? This episode of National Geographic's Decoder explains how our eyes and brains work together...
Tableaux Vivants: Caravaggio paintings performed live
Actors from the Italian theater company Ludovica Rambelli Teatro recreate paintings by Italian painter Michelangelo Merisi da Caravaggio, or, more accurately, they're recreating how Caravaggio created scenes to paint ...
How do roller coasters affect your body?
In 1895, crowds flooded Coney Island to see America’s first-ever looping coaster: the Flip Flap Railway. But its thrilling flip caused cases of severe whiplash, neck injury and even ejections. Today, coasters can pull...
Where Do Teeth Come From?
How long teeth can last? 30,000 years? 200,000 years? 300 million years? In this episode of It's Okay to Be Smart, Joe Hanson gets an up-close look at some ancient saber-toothed tiger (smilodon), mastodon, tyrannosaur...
How does sound travel to our brains?
How does a sound, like music played on a trumpet, travel from the source through our ears and to our brains? This animated video from the National Institute on Deafness and Other Communication Disorders describes the ...
Okuda San Miguel paints a colorful 23-story mural in Toronto
Okuda San Miguel works up high on a swing stage scaffold, the same kind of suspended platform that window washers use. The internationally renowned Spanish street artist sprays sharp edges of bright color fields. They...
Gazing into the eyes of SEER: The Simulative Emotional Expression Robot
This young looking face with light eyes, expressive eyebrows, and a Mona Lisa smile is named SEER, an acronym for Simulative Emotional Expression Robot. It was created by Japanese artist Takayuki Todo to explore the p...
The World in UV
See The World in Ultraviolet, a similar but strange view compared to what our human eyes perceive in the visible spectrum. In this Veritasium video, Derek Muller explores how the ultraviolet makes eyeglasses, flowers,...
Gokurōsama
It's morning time and the Japanese supermall is preparing to open for business. Two women in a food shop are getting ready, too, until the older woman's back goes out. How will her young assistant help her visit the c...
It’s Okay to Fart: What are farts made of and why are they funny?
Farts can be giggle-worthy and gross, but every person on Earth farts, as well as lots of animals... so why don't we know more about them? Even people throughout history have wrestled with what farts are and how they ...
The Science of Hearing
The ability to recognize sounds and identify their location is possible thanks to the auditory system. That’s comprised of two main parts: the ear, and the brain. The ear’s task is to convert sound energy into neural ...
Kids Meet a Person With Cerebral Palsy
While Cerebral Palsy (pronounced seh-ree-brel pawl-zee) is a blanket term commonly referred to as “CP” and described by loss or impairment of motor function, Cerebral Palsy is actually caused by brain damage. The brai...
What is dust made of?
Less than a tenth the size of an ant, a dust mite’s whole world is contained in the dusty film under a bed or in a forgotten corner. This realm is right under our noses, but from our perspective, the tiny specks of br...
What causes constipation?
Visiting the bathroom is part of the daily human experience. But occasionally, constipation, a condition that causes a backup in your digestive system, strikes. In some especially uncomfortable cases, the food you eat...
How Birds Get Oxygen Inside Their Eggs
"Look inside this incubator. These eggs were laid 21 days ago and this one is just about to hatch. If you listen you can hear the chick pecking at the inside of its shell. Soon it will break through and take its first...
What causes body odor?
Most of us don’t need more than one whiff to identify that generally unpleasant, characteristic smell we call body odor. But it’s a surprisingly complex phenomenon, influenced by our genetic makeup, age, diet, and hyg...
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