Topic: science

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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...

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...

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...

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...

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,...

The longest continuous time lapse from space

Since the very first module Zarya launched from Baikonur Cosmodrome on 20 November 1998, the International Space Station has delivered a whole new perspective on this planet we call home. Join us as we celebrate 20 ye...

Gitanjali Rao: Finding solutions to real problems

Colorado seventh-grader Gitanjali Rao wants to find solutions to real problems, so when she learned about the water crisis in Flint, Michigan on the news, she wanted to help. From Rookie Mag: After coming across a...

How can bananas make music?

If you've ever wondered how musical circuit boards like the Makey Makey Invention Kit or the Ototo experimental PCB-based synthesizer work, this video from BBC Earth Lab breaks down the science. Sound artist and d...

Thermal expansion sphere and ring demonstrations

If you ever had trouble twisting open a jar lid that's stuck, try running it under some hot water. When you try again, it will most likely pop open with a twist thanks to thermal expansion. Most (but not all) matter w...

Dinosaurs probably didn’t roar. What did they sound like?

If birds are living dinosaurs—"the only survivors of the mass extinction that wiped out their giant relatives 65 million years ago"—then did dinosaurs really sound like the roaring mammals that we've heard in the movi...

Float by Susi Sie

Bubbles and droplets of oil in water slowly float around as if in space until... plink! They pop together. Or pop apart? Float is an award-winning 2011 film by Susi Sie with music and sound design by Thomas Schuessler...

How far would you have to go to escape gravity?

Every star, black hole, human being, smartphone and atom are all constantly pulling on each other due to one force: gravity. So why don’t we feel pulled in billions of different directions? And is there anywhere in th...

The Beauty of Flames

The Beauty of Flames captures some extraordinary-looking flames, "the visible, gaseous part of a fire," in this video from Yan Liang's Envisioning Chemistry science and art series. The flames were created by Professor...

How does bumblebee barf create a queen?

What causes a baby bumblebee (the fuzzier and more weather-hardy cousins to honey bees) to become royalty remains a mystery. They don’t produce royal jelly but they produce a unique barf for their young. Enter entomol...

Airglow & the secrets behind Earth’s colorful ionosphere

What does our planet look like from space? Most are familiar with the beloved images of the blue marble or pale blue dot -- Earth from 18,000 and 3.7 billion miles away, respectively. But closer to home, within the ne...

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