How many verb tenses are there in English?
Lesson duration 04:28
How many different verb tenses are there in a language like English? At first, the answer seems...
Lesson duration 04:28
How many different verb tenses are there in a language like English? At first, the answer seems...
Lesson duration 06:02
Do you ever talk to your dog? Do they ever talk back? Humans and dogs have a truly amazing...
Lesson duration 04:45
You may take them for granted, but your teeth are a marvel. They break up all your food over the...
Lesson duration 05:00
Every two seconds, someone in the world has a stroke. One out of every six people will have a...
Lesson duration 03:47
Why do mirrors appear to flip images horizontally but not vertically? Physics Girl explains.
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In 2026, an unmanned NASA spacecraft is scheduled to arrive at 16 Psyche, a massive, metallic...
Lesson duration 16:03
The Italian island of Sardinia has more than six times as many centenarians as the mainland and...
Lesson duration 05:40
When historians talk about the atrocities of the 20th century, we often think of those that took...
Lesson duration 05:26
As a world-renowned treasure hunter, you have been searching for the legendary dungeon containing...
Lesson duration 03:50
In a typical hero’s journey, the protagonist sets out on an adventure, undergoes great change and...
Lesson duration 04:45
Shielded by our thick skulls and swaddled in layers of protective tissue, the human brain is...
Lesson duration 07:21
What if we could stop aging forever? Kurzgesagt – In a Nutshell looks at three different tools...
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The hard choices - what we most fear doing, asking, saying - are very often exactly what we need...
Lesson duration 04:41
The marriage of Orpheus, the greatest of all poets and musicians, to Eurydice, a wood nymph, was...
Lesson duration 03:39
The Internet of Things gives us access to the data from millions of devices. But how does it...
Lesson duration 05:23
Inside you, a daily battle is being waged and your immune system is at the frontline. Most of the...
Lesson duration 04:44
Colon cancer is one of the leading causes of cancer and cancer death in the world. It is also one...
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Human beings and computers alike share the challenge of how to get as much done as possible in a...
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The starving orphan seeking a second helping of gruel. The spinster wasting away in her tattered...
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When many individual organisms come together and move as one entity, that’s a swarm. From a...
Lesson duration 04:57
Constantly churning inside of you, the digestive system performs a daily marvel: it transforms...
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About 2500 years ago, the writing of history as we understand it didn’t really exist. Then, a...
Lesson duration 05:55
Every year, the world uses 35 billion barrels of oil. This massive scale of fossil fuel...
Lesson duration 05:30
Imagine aliens land on Earth a million years from now. What will these curious searchers find of...