Architectural secrets of the world’s ancient wonders - Brandon Clifford
Lesson duration 04:23
How did ancient civilizations move massive stones to build Stonehenge, the Pyramids and the...
Lesson duration 04:23
How did ancient civilizations move massive stones to build Stonehenge, the Pyramids and the...
Lesson duration 05:31
Consider the spot where you’re sitting. Travel backwards in time and it might’ve been submerged...
Lesson duration 05:33
In 1943, Allied aircraft rained tens of thousands of leaflets on Nazi Germany below. The leaflets...
Lesson duration 05:01
It was the largest contiguous land empire in history— stretching from Korea to Ukraine, and from...
Lesson duration 05:15
Hercules, the strongest man alive with a mighty heart to match. Orpheus, charmer of nature and...
Lesson duration 04:57
Billions of years ago, simple organic compounds assembled into more complex coalitions that could...
Lesson duration 04:48
The year is 1676, and a treaty has officially ended hostilities between the Polish-Lithuanian...
Lesson duration 04:41
Desperate to escape his tyrannical father and the family curse he feels doomed to repeat, Haruki...
Lesson duration 05:20
Where do you go to quench your thirst? The kitchen sink? The local bar? The mineral-rich springs...
Lesson duration 04:25
It was a normal Tuesday at the superconductor, until a bug in the system caused your team to be...
Lesson duration 05:16
Quantum computers could eventually outstrip the computational limits of classical computers. They...
Lesson duration 10:37
Being open and vulnerable with your loneliness, sadness and fear can help you find comfort and...
Lesson duration 05:05
At a Maryland country fair in 2017, farmers reported feverish hogs with inflamed eyes and running...
Lesson duration 04:31
In May 1940, with the German army ready to occupy Paris, Noor Inayat Khan was faced with a...
Lesson duration 05:05
In the city of Alexandria in 415 CE, the bishop and the governor were in a fight. It started with...
Lesson duration 04:46
Modern turtle shells are almost as diverse as the turtles themselves. Sea turtles have flatter,...
Lesson duration 13:07
Anger researcher Ryan Martin draws from a career studying what makes people mad to explain some...
Lesson duration 04:50
15th century Europeans believed they had hit upon a miracle cure: a remedy for epilepsy,...
Lesson duration 04:50
A romantic and a revolutionary, Pablo Neruda was one of the most celebrated poets of the 20th...
Lesson duration 13:31
In an inspiring talk, educator and activist Brittany Packnett shares three ways to crack the code...
Lesson duration 05:11
In the 16th century, an anatomist named Andreas Vesalius made a shocking discovery: the most...
Lesson duration 04:25
It’s an incredible discovery: an abandoned alien space station filled with precursor technology....
Lesson duration 04:43
What would it be like to have a limitless memory? Can the meaning of life be found in an infinite...
Lesson duration 04:28
At some point, most sexually active people will be infected with human papillomavirus, or HPV....