Is fire a solid, a liquid, or a gas?
Lesson duration 04:35
Sitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If...
Lesson duration 04:35
Sitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If...
Lesson duration 17:01
Right now, billions of neurons in your brain are working together to generate a conscious...
Lesson duration 04:55
Humans have been battling heartburn for hundreds, if not thousands, of years. But recently the...
Lesson duration 05:17
Día de los Muertos, or Day of the Dead, is a celebration of life and death. While the holiday...
Lesson duration 05:19
Spindly trees, rusted gates, crumbling stone, a solitary mourner: these things come to mind when...
Lesson duration 05:02
In 1895, crowds flooded Coney Island to see America’s first-ever looping coaster: the Flip Flap...
Lesson duration 08:49
Humans love meat: steak, fried chicken, bacon, sausages. Yet meat is the most inefficient way of...
Lesson duration 04:51
Townspeople are demanding that a corrupt merchant’s collection of 30 rubies be confiscated to...
Lesson duration 05:16
The earliest time measurements were observations of cycles of the natural world, using patterns...
Lesson duration 04:08
You've probably heard that if you swallow chewing gum, it stays in your stomach for 7 years. But...
Lesson duration 04:58
Anna Komnene, daughter of Byzantine emperor Alexios, spent the last decade of her life creating a...
Lesson duration 14:29
Stress. It makes your heart pound, your breathing quicken and your forehead sweat. But while...
Lesson duration 05:08
The difference between despair and hope often boils down to different ways of telling stories...
Lesson duration 04:32
Though the common ancestor of all modern birds could fly, many different bird species have...
Lesson duration 01:25
This animation is part of our series, "There's a Poem for That," which features animated...
Lesson duration 04:40
Concrete is the most widely used construction material in the world. It can be found in swathes...
Lesson duration 05:04
Two men, Estragon and Vladimir, meet by a tree at dusk to wait for someone named “Godot.” So...
Lesson duration 05:12
The Ancient Egyptian king Thutmose III described the chicken as a marvelous foreign bird that...
Lesson duration 05:39
Mounting his skinny steed, Don Quixote charges an army of giants. It is his duty to vanquish...
Lesson duration 05:48
There’s a 99% chance that your keyboard says QWERTY. How did this pattern of letters become so...
Lesson duration 04:52
The good news is that your experimental robo-ants are a success. The bad news is that you...
Lesson duration 04:34
Are bats really blind? Not exactly. Besides their eyes, bats use a special process called...
Lesson duration 05:42
Did humans evolve from monkeys or from fish? In this TED Talk, ichthyologist and TED Fellow...
Lesson duration 05:15
The vast majority of people who’ve lost a limb can still feel it — not as a memory or vague...