The dark history of Mount Rushmore
Lesson duration 05:14
Between 1927 and 1941, workers blasted 450,000 tons of rock from a mountainside using chisels,...
Lesson duration 05:14
Between 1927 and 1941, workers blasted 450,000 tons of rock from a mountainside using chisels,...
Lesson duration 05:19
A mother honeyguide has placed its chick into a bee-eater’s nest— puncturing all the other eggs...
Lesson duration 13:40
Hold on to your butts. The science and evolutionary history of your rear end, the down-low on...
Lesson duration 05:05
During the 17th century, the Dutch East India Company cornered the booming spice market and...
Lesson duration 05:19
Sending rockets into space requires sacrificing expensive equipment, burning massive amounts of...
Lesson duration 08:35
In the ’80s, scientists discovered there was a hole in the ozone over the South Pole. Projections...
Lesson duration 05:52
In 2007, researchers surveyed 180 teachers to understand if they held stereotypes about their...
Lesson duration 15:16
What makes you, you? Psychologists like to talk about our traits, or defined characteristics that...
Lesson duration 04:34
The first pairs of jeans were designed for durability; denim was constructed as a sturdy weave...
Lesson duration 05:16
On a reef in the Pacific Ocean, 17,000 camouflage groupers dart about in the cloudy water. It is,...
Lesson duration 05:29
They call you the human cannonball. Your act involves flying through rings of fire, bouncing...
Lesson duration 11:32
Teachers emotionally support our kids — but who's supporting our teachers? In this eye-opening...
Lesson duration 02:49
The Gettysburg Address is a speech delivered by Abraham Lincoln during the American Civil War....
Lesson duration 04:20
If you were a jackrabbit in the desert, you’d be glad to stumble across a cactus: the flesh of...
Lesson duration 04:39
It may seem counterintuitive, but comedy is often key to a serious story. As a writer, you need...
Lesson duration 08:15
In the mid-1800s, a cultural belief known as “manifest destiny” dictated that white settlers were...
Lesson duration 09:44
In 1960, when she was just 6 years old, Ruby Bridges walked past hateful protesters and into a...
Lesson duration 04:57
One day, twin brothers Junajpu and Ixb’alanke discovered their father’s hidden ballgame equipment...
Lesson duration 04:40
A leather mask that clamps the mouth shut. A cannonball sewn into a soldier’s uniform. A machine...
Lesson duration 01:31
For places that observe daylight saving time, gaining or losing an hour of sleep doesn’t just...
Lesson duration 05:46
A ravenous swarm stretches as far as the eye can see. It has no leader or strategic plan; its...
Lesson duration 05:14
In 2013, a group of researchers wanted to create an AI system that could beat every Atari game....
Lesson duration 05:25
The dwarves were master craftspeople. One dwarf, Andvari, forged marvelous creations. He often...
Lesson duration 05:20
By the end of the 19th century, nearly 40% of American cars were electric. But these vehicles had...