Social Studies
One day in the coldest village on Earth
Lesson duration 17:35
In Yakutia— the coldest inhabited region on Earth— daily life is a constant struggle against...
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Results for "earth day" (58)
Literature & Language
The Chinese myth of the forbidden lovers
Lesson duration 05:10
In the court of the Jade Emperor, a young princess had a special skill: she could pluck clouds...
Science & Technology
How do heat waves affect your body?
Lesson duration 06:06
In many parts of the world heat waves are happening more often with greater intensity and for...
Science & Technology
Scientists are obsessed with this lake
Lesson duration 05:38
In the millions of years since oxygen began saturating Earth’s oceans and atmosphere, most...
Science & Technology
What's happening to Earth's core?
Lesson duration 05:33
A hydrogen atom is traveling high within the outermost layer of Earth’s atmosphere. This...
Social Studies
The myth of Hades and Persephone
Lesson duration 05:33
One day, Persephone was frolicking in a meadow with the nymph, Cyane. As they admired a flower,...
Design, Engineering & Technology
How do solar panels work?
Lesson duration 04:59
The Earth intercepts a lot of solar power: 173,000 terawatts. That’s 10,000 times more power than...
Science & Technology
The Sun’s surprising movement across the sky
Lesson duration 04:23
Suppose you placed a camera at a fixed position, took a picture of the sky at the same time every...
Science & Technology
Could we actually live on Mars?
Lesson duration 04:30
There's a lot of talk these days about when and how we might all move to Mars. But what would it...
Health
What would happen if everyone stopped eating meat tomorrow?
Lesson duration 04:37
Imagine if a wizard of meatless dining suddenly appeared on Earth and with one wave of a wand...
Science & Technology
Why are we warm-blooded?
Lesson duration 11:38
Staying warm by making your own heat takes a ton of energy. And that brings up a paradox, because...
Mathematics
Can you solve the alien pyramid riddle?
Lesson duration 05:13
Today is the anniversary of the best-worst day of your life. The best part was discovering a...
Science & Technology
A Pale Blue Dot: The Ultimate Earth "selfie..."
Lesson duration 01:41
A Pale Blue Dot was written in 1990 by Carl Sagan in response to a NASA photograph that he...
Science & Technology
What causes the phases of the moon?
Lesson duration 04:33
What causes the phases of the moon? The common incorrect answer is the shadow of the Earth. The...
Social Studies
Why does February only have 28 days?
Lesson duration 04:46
Why does February have 28 days when all the other months get 30 or 31? The answer is part...
Science & Technology
Why are there two tides a day?
Lesson duration 05:21
In the 17th century, Isaac Newton offered the first gravitational explanation of tides. As he...
Mathematics
Einstein's twin paradox explained
Lesson duration 06:16
On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain...
Design, Engineering & Technology
Why can't we get power from waves?
Lesson duration 03:16
The ocean is covered with literal waves of energy, and if we could convert this energy into...