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Crash Course
The Railroad Journey and the Industrial Revolution: Crash Course World History 214
In which John Green teaches you about railroads, and some of the ways they changed the world, and how they were a sort of microcosm for the Industrial Revolution as a whole. Prior to the invention of steam powered railroads, pretty much...
PBS
Why culture shock is a valuable part of ‘thoughtful travel,’ according to Rick Steves
Millions of Americans are expected to go on a European vacation this summer. Many of those going for the first time are likely to be following the advice of travel writer Rick Steves, host of “Rick Steves’ Europe” on PBS stations. John...
MinuteEarth
How Does Birth Control Work?
There are huge varieties of birth control methods because there are lots of different ways to disrupt the process of sperm-egg fertilization.
MinuteEarth
Why Don't Electric Eels Shock Themselves?
Electric eels can emit some of the largest shocks in the animal kingdom - but why don't they shock themselves?
TED Talks
TED: What you can learn crossing the ocean in a canoe | Lehua Kamalu
“Being on a voyage forces you to unplug,” says TED Fellow and third-generation captain Lehua Kamalu. Sharing ancient knowledge from traditional Hawaiian ocean voyaging, she reflects on the transformational power of seafaring journeys —...
TED Talks
TED: The magical, mesmerizing migration of monarch butterflies | Jaime Rojo
When monarch butterflies migrate, they produce one of the most iconic wildlife spectacles in the world — and provide us with an important indicator of ecological health, says photographer Jaime Rojo. Telling a story about our...
MinutePhysics
What if the Earth Were Hollow
What if there were a tunnel through the middle of the earth and you jumped in?
MinutePhysics
The Astounding Physics of N95 Masks
TED Talks
TED: Time traveling with AI to connect with lost loved ones | Amy Kurzweil
What if AI could bring the past to life? Cartoonist Amy Kurzweil shares how she helped train an AI chatbot on her late grandfather’s archives, allowing her to connect with a family member she never met — and discover family history she...
SciShow
Photonic Propulsion: Mars in 3 Days?
We can get to Mars in 3 days, . . .sort of, maybe. In this episode of SciShow Space Reid Reimers explains the possibilities of photonic propulsion in use with space travel.
TED Talks
TED: What happens when we deny people abortions? | Diana Greene Foster
How does getting an abortion — or not — influence a woman's life? Demographer Diana Greene Foster puts forward the results of The Turnaway Study, her landmark work following nearly 1,000 women through abortion or childbirth, presenting...
SciShow
The World’s Biggest Aircraft Can Fly for a Week
It's a bird, it's a plane, it's a... peach emoji? The Airlander 10 is the world's biggest currently operational aircraft, and though it won't be setting any speed records, it may hold the key to greener, more sustainable commercial and...
SciShow
The Zombie Planet at the Center of the Earth
For years, geologists have been searching for an explanation for two strange blobs of Earth's mantle that are denser than the rest. It turns out, they may not be original parts of Earth at all.
SciShow
Why Do We Cry On Planes?
Have you ever found yourself getting teary-eyed on a plane, and not because of the lack of legroom? Turns out there's a few good reasons that science says that's totally normal. Don't forget to throw some tissues in your carry-on.<br/>
TED Talks
TED: Life on the frontlines of war reporting | Jane Ferguson
Covering global war stories can be hard and thankless — but it's critical work if the rest of us are to understand what's really going on in the world. For nearly two decades, journalist Jane Ferguson has reported on hostilities across...
SciShow
New and Ancient Lessons from Lunar Eclipses
Ancient perceptions of lunar eclipses weren’t as primitive as one might think. Some rigorous math was applied to these cosmic events that shaped our understanding of the solar system.<br/>
SciShow
The Particle So Extreme Scientists Called it OMG
In 1991, a subatomic particle smashed into Earth's atmosphere traveling faster than anything humans can replicate. It's the most energetic particle detected to date, and maybe even the fastest (except light itself). Astronomers call it...
PBS
Cosmic Microwave Background Challenge | Space Time | PBS Digital Studios
If a photon leaves the train station shortly after the Big Bang ...
PBS
Is Interstellar Travel Impossible?
Space is pretty deadly. But is it so deadly that we’re effectively imprisoned in our solar system forever? Many have said so, but a few have actually figured it out.
PBS
Will Wormholes Allow Fast Interstellar Travel?
From Stargate to Interstellar, wormholes are our favorite method for traveling across fictional universes. But they are also a very serious field of study for some of our greatest minds over the last century. So what’s the holdup? When...
PBS
What’s On The Other Side Of A Black Hole?
Normal maps are useless inside black holes. At the event horizon - the ultimate point of no return as you approach a black hole - time and space themselves change their character. We need new coordinate systems to trace paths into the...
PBS
The NEW Warp Drive Possibilities
That Einstein guy was a real bummer for our hopes of a star-hopping, science-fiction-y future. His whole “nothing travels faster than light” rule seems to ensure that exploration of even the local part of our galaxy will be an...
PBS
How Far Beyond Earth Could Humanity Spread?
We humans have always been explorers. The great civilizations that have arisen across the world are owed to our restless ancestors. These days, there’s not much of Earth left to explore. But if we look up, there’s a whole universe out...