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Why does T-Rex have tiny arms?

"Tyrannosaurus rex was big, Tyrannosaurus rex was vicious, and Tyrannosaurus rex had tiny arms." In this PBS Eons episode, Hank Green explains how the Tyrannosaurus rex lost its arms over the course of 90 million year...

The expertise of killer whale grandmothers

Pods of killer whales [also known as orcas] inhabit the waters of every major ocean on Earth. Each family is able to survive thanks mainly to one member, its most knowledgeable hunter: the grandmother. These matriarch...

Hummingbird Battleground in the Talamanca Mountains

The presence of a backyard hummingbird feeder can reveal the competitive nature of hummingbirds. Notorious for chasing each other away from nectar sources, hummingbirds are territorial because they need to stay fueled...

Linus and Lucy, a Ska-lliday Cover

Playing keyboard, trumpet, trombone, guitar, and bass guitar, 23-year-old musician Jeremy Hunter of Skatune Network adds a ska twist to the Vince Guaraldi classic Linus and Lucy. Named for the fictional siblings Li...

Life Cycle: Ai Weiwei in Los Angeles

Made from the traditional kite-making materials—bamboo and silk—mythical creatures float above large figures in a boat. Millions of sunflower seeds, handmade and painted porcelain pieces made by 1,600 artisans in Jing...

Travel deep inside a redwood tree leaf

Travel down into a small flat redwood tree leaf through a stoma, a tiny opening in its surface. This animation from the California Academy of Sciences takes us on a scientifically accurate journey into a palisade cell...

The record-setting Queen of Limbo

Shemika Campbell hails from a long line of limbo. Both her mother and her grandmother were limbo dancers, carrying on the traditionally Trinidadian form of dance. Shemika is keeping up the family legacy, taking limbo ...

4 Levels of Spaghetti & Meatballs: Amateur to Food Scientist

We challenged chefs of three different levels - an amateur, a home cook and a professional chef - to make their versions of spaghetti & meatballs. And then we brought in a food scientist to review their work. What...

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 is surface tension? Ask a water strider.

Modern technologies like high speed cameras can allow us to see what was previously 'invisible' to the naked eye. This clip from Richard Hammond's Invisible Worlds provides two memorable slow motion examples: A speedy...

Can you solve the time travel riddle?

Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colo...

Percussion instruments: Eleven demonstrations

Spend 17 minutes with 11 instruments found in the percussion section of an orchestra. This thoughtful percussion instruments video from London's Philharmonia Orchestra is chock-full of short, fascinating demonstration...

Saving the Island Fox

How did a team of conservationists, veterinarians, and volunteers help a rare species of fox come back from the brink of extinction? And why did this little fox almost go extinct in the first place? This is the st...

Mysteries of the world’s biggest dome

How did Filippo Brunelleschi use engineering, design, math, and secrecy to build the world's biggest dome? "...Experts still don't fully understand the brilliant methods he used in constructing the dome, which tops th...

Crow herding with urban falconry in Portland

“Downtown Portland seems to be a very inviting place for crows and I think the reason for that is due to the presence of garbage and food and lights and warmth, and it’s a relatively predator-free environment,” [bird ...

An accidental toy inventor’s shapeshifting designs

What if we could make objects transform in the same way a flower unfolds from its bud? This is what designer, Harvard professor, and accidental toy inventor Chuck Hoberman is trying to figure out. His work, ranging fr...

Line Riders ride to Beethoven’s 5th

Three Line Riders sled, skid, and sail across a choreography of lines. Written between 1804 and 1808, the accompanying music is from the first movement of Ludwig van Beethoven's '5th symphony'. It's "one of the best-k...

Shattering glass with the World’s Largest Horn

How do horns amplify sound? Why are they flared at the ends? And how do airhorns work? Mark Rober wanted to find out so he spent eight months building a massive air horn... perhaps the world's largest horn. In this...

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