Topic: time

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Gravitational Waves Explained Using Stick Figures

How are gravitational waves made? In this episode of MinutePhysics, Henry Reich draws up a series of other wave creating scenarios -- water waves, air pressure waves, and radio waves -- to help explain gravitational w...

Tony Hawk goes for the 900 at 48 years old

Exactly seventeen years after he became the first skateboarder to land a 900 -- "a 2½-revolution (900 degrees) aerial spin performed on a skateboard ramp" -- skateboard legend Tony Hawk attempts to land a 900 at age 4...

How Old Is Your Body, Really?

Have you ever heard the statement that the cells in your body are completely replaced every seven years? Is this true? In this beautifully illustrated episode of Skunk Bear, NPR's Adam Cole explores how long our diffe...

Explaining The Tree of Life

Travel millions of years through time with Sir David Attenborough as he explains The Tree of Life. Some background on the metaphor from The New York Times: In his 1859 book “On the Origin of Species,” Charles Darw...

The Dipped Painting Project by Oliver Jeffers

From children's book author and illustrator Oliver Jeffers, a project that explores memory and loss in a mix of art and experience: The Dipped Painting Project. In November of 2014 I began the first of a series of ...

How Far Can We Go? Limits of Humanity – Kurzgesagt

Is there a border we will never cross? Are there places we will never be able to reach, no matter how hard we try? It turns out there are. Even with science fiction technology, we are trapped in our pocket of the univ...

Petrified Forest National Park & how petrified wood is made

Fallen coniferous trees from 211-218 million years ago can be found scattered across the desert of eastern Arizona in the form of petrified wood. Made primarily from quartz, these geological wonders are actually fossi...

Ma’agalim, Jane Bordeaux, & journeys inside an old penny arcade

"In a forgotten old penny arcade a wooden doll is stuck in place and time." This is Ma'agalim (Circles), a beautifully animated music video by Tel Aviv-based band Jane Bordeaux and director Uri Lotan.

Space Rocks: Comets, asteroids, meteors, & meteorites

This claymation primer on comets, asteroids, meteoroids, meteors, and meteorites helps us learn about Space Rocks in a super adorable way. Made by Beakus for the Royal Observatory Greenwich, the animation is one in a ...

How does Leap Year work?

What is Leap Year, why do we have it, and how does it work? Vox explains and explores another question: When do leap year babies -- born on the rare date of February 29th -- celebrate their birthdays? This is an ex...

ALMA, a telescope so powerful it can see into the past

There’s a telescope deep in Chile’s Atacama Desert that takes pictures so massive that it requires a supercomputer as powerful as 16 million PCs to decipher the images. This is the Atacama Large Millimeter Array (ALMA...

LIGO & The First Observation of Gravitational Waves – CalTech

On September 14, 2015 at 5:51am ET, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected ripples in the fabric of spacetime. One hundred years after Albert Einstein predicted the existence of gravit...

40,000 years of London history created with papercraft

Peel back the pavement of a grand old city like London and you can find just about anything, from a first-century Roman fresco to a pair of medieval ice skates—even an elephant’s tooth. As one of Europe’s oldest capit...

How do living things change their environments?

Think about your day, from when you wake up, to where you spend your day, to your bedtime routine at night. Crash Course Kids asks, "What pieces of it are a result of human intervention? Where did these pieces come fr...

The 12 Days of Evolution – It’s Okay to Be Smart

Joe Hanson of It's Okay To Be Smart celebrates the diversity of life with 12 days of videos dedicated to explaining evolution and natural selection. Above: What is evolution, anyway? From Berkeley’s Understanding ...

How to paint with ice skates, a light painting beginner’s guide

This tutorial for light painting is a great introduction for how long exposure photographs capture motion, and change the amount of light in an image. At-Bristol Science Centre's Heather Nichol explains how to modify ...

General relativity & why GPS wouldn’t work if we didn’t know about it

General relativity, what Albert Einstein said was the happiest thought of his life, basically expands upon the idea that "the laws of physics are the same everywhere". Light and gravity behave in the same way for you....

Paleoartist John Gurche reconstructs the face of Homo naledi

Paleoartist John Gurche is known for his award-winning reconstructions of our ancient human ancestors. His process of mixing forensic accuracy with emotional realism has been featured in documentaries by National Geog...

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