Category: gif

“Well-behaved women seldom make history.” – La…

“Well-behaved women seldom make history.” – Laurel Thatcher Ulrich

Watch the TED-Ed Lesson Did the Amazons really exist? – Adrienne Mayor to uncover the mysteries of these women warriors.

Animation by Silvia Prietov

In 1898, Marie and Pierre Curie discovered rad…

In 1898, Marie and Pierre Curie discovered radium. Claimed to have restorative properties, radium was added to toothpaste, medicine, water, and food. A glowing, luminous green, it was also used in beauty products and jewelry. It wasn’t until the mid-20th century we realized that radium’s harmful effects as a radioactive element outweighed its visual benefits.

Unfortunately, radium isn’t the only pigment that historically seemed harmless or useful but turned out to be deadly. That lamentable distinction includes a trio of colors and pigments that we’ve long used to decorate ourselves and the things we make: white, green, and orange.

To learn about these other ‘deadly colors’, watch the TED-Ed Lesson History’s deadliest colors – J. V. Maranto

Animation by Juan M. Urbina

Fun Fact Friday!

Fun Fact Friday!

The biggest obstacles a human would encounter living on the moon is cosmic radiation. Unlike the Earth, the moon has no atmosphere and no magnetic field. A person on its surface could receive over 400 times the maximum safe dosage of heavy ion radiation, enough to be fatal within ten hours, even in a spacesuit.

From the TED-Ed Lesson What would it be like to live on the moon? – Alex Gendler

Animation by Allen Laseter

teded: Did you know fireworks were originally…

teded:

Did you know fireworks were originally used to chase away evil spirits?

From the TED-Ed Lesson The deadly irony of gunpowder – Eric Rosado

Animation by Zedem Media

teded: Happy Fourth of July! From the TED-Ed …

teded:

Happy Fourth of July!

From the TED-Ed LessonA 3-minute guide to the Bill of Rights – Belinda Stutzman

Animation by Jacques Khouri

Many of us will experience some kind of trauma…

Many of us will experience some kind of trauma during our lifetime. Sometimes, we escape with no long-term effects. But for millions of people, those experiences linger, causing symptoms like flashbacks, nightmares, and negative thoughts that interfere with everyday life.

This phenomenon, called post-traumatic stress disorder, or PTSD, isn’t a personal failing; rather, it’s a treatable malfunction of certain biological mechanisms that allow us to cope with dangerous experiences.

PTSD has been called “the hidden wound” because it comes without outward physical signs. But even if it’s an invisible disorder, it doesn’t have to be a silent one.

To learn about the science of PTSD, watch the TED-Ed Lesson The psychology of post-traumatic stress disorder – Joelle Maletis

Animation by Tomás Pichardo-Espaillat

The First Asteroid Ever Discovered

teded:

On the night of January 1, 1801, Giuseppe Piazzi, a priest in Palermo, Italy, was mapping the stars in the sky. Over three nights, he’d look at and draw the same set of stars, carefully measuring their relative positions.

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That night, he measured the stars. The next night, he measured them again. To his surprise, one had moved. The third night, the peculiar star had moved again. This meant it couldn’t be a star at all.

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It was something new, the first asteroid ever discovered, which Piazzi eventually named Ceres. Asteroids are bits of rock and metal that orbit the Sun. At over 900 kilometers across, Ceres is a very large asteroid. But through a telescope, like Piazzi’s, Ceres looked like a pinpoint of light similar to a star. In fact, the word asteroid means star-like. You can tell the difference between stars and asteroids by the way they move across the sky. Of course, Piazzi knew none of that at the time, just that he had discovered something new. To learn about Ceres, Piazzi needed to track its motion across the sky and then calculate its orbit around the Sun. 

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So each clear night, Piazzi trained his telescope to the heavens. Night after night, he made careful measurements, but from his observations he learned that Ceres was only visible in the sky during the day. It would take another year and a lot of astronomers to nail down Ceres’ path, but we haven’t lost track of it since.

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Today, we can do something that Piazzi could only dream of: send spacecraft to study asteroids up close. One spacecraft called Dawn journeyed billions of kilometers over four years to the main asteroid belt. There, it visited Ceres and another asteroid, Vesta. Dawn’s stunning images transformed Piazzi’s dot of light into a spectacular landscape of craters, landslides, and mountains.

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From the TED-Ed Lesson The first asteroid ever discovered – Carrie Nugent

Animation by TED-Ed / Reza Riahi

Fun Fact Friday!

Fun Fact Friday!

Pluto completes a full orbit once every 248 Earth years.

Slow and steady, Plutes! Slowww and steady…

From the TED-Ed Lesson The journey to Pluto, the farthest world ever explored – Alan Stern

Animation by Eoin Duffy

Since the time of Homer, ancient stories told …

Since the time of Homer, ancient stories told of fierce warriors dwelling beyond the Mediterranean world, striking fear into the mightiest empires of antiquity. Their exploits were recounted by many epic poets. They fought in the legendary Trojan War and their grand army invaded Athens. Jason and the Argonauts passed by their shores, barely avoiding their deadly arrows. These formidable fighters faced off against the greatest champions of myth: Heracles, Theseus, and Achilles. 

And every single one of these warriors was a woman.

The war-loving Amazons, “the equals of men” in courage and skill, were familiar to everyone in ancient Greece. But were Amazons merely figures of myth, or something more?

Watch the TED-Ed Lesson Did the Amazons really exist? – Adrienne Mayor to uncover the mysteries of these women warriors.

Animation by Silvia Prietov

All of the feeeeeels.

All of the feeeeeels.

From the TED-Ed Lesson Would winning the lottery make you happier? – Raj Raghunathan

Animation by Allen Laseter