PBS
Underground Railroad
Jeffrey Brown looks at the newly-opened National Underground Railroad Freedom Center, which chronicles the struggle of slaves seeking freedom in pre-Civil War America.
Crash Course
Where Does Wind Come From Crash Course Geography
There's an invisible force shaping our lives, affecting the weather, climate, land, economy, and just whether a flag looks majestic or not - we're talking about the wind! Today we’re going to go into the science of where the wind comes...
Crash Course
Venice and the Ottoman Empire Crash Course World History
In which John Green discusses the strange and mutually beneficial relationship between a republic, the citystate of Venice, and an Empire, the Ottomans--and how studying history can help you to be a better boyfriend and/or girlfriend....
Curated Video
The Seven Years War: Crash Course World History
In which John teaches you about the Seven Years War, which may have lasted nine years. Or as many as 23. It was a very confusing was. The Seven Years War was a global war, fought on five continents, which is kind of a lot. John focuses...
SciShow
Is There Less Oxygen in the Winter Since Its Colder
Plants make oxygen using photosynthesis, but what happens to the air when those trees drop their leaves in winter?
SciShow
Oh No...Is Nature Going to Make Climate Change WORSE?! | SciShow News
Photosynthesis plays a huge role in regulating the earth's CO2. But what happens when the temperature gets high enough that photosynthesis slows down?
TED Talks
TED: A bold plan to protect 30 percent of the Earth's surface and ocean floor | Enric Sala
As a diver in the 1970s, marine ecologist Enric Sala saw once-lush oceanscapes reduced to underwater deserts -- but later, in marine preserves across the globe, he also witnessed the ocean's power to rejuvenate itself when left to its...
SciShow
A Brief History of Life: When Life Exploded
Right at the beginning of the Paleozoic, there was a huge explosion of more complex life. And that’s when things started to get really interesting. This is our second installment on the history of life, but you can watch in any order you...
TED-Ed
TED-Ed: The fish that walk on land | Noah R. Bressman
We think of fish as completely aquatic animals. But there are actually hundreds of fish species that are amphibious, meaning that they possess adaptations that enable them to survive on land. Once on land, however, they face suffocation,...
TED Talks
TED: The real hotbed of innovation (hint: it's not big cities) | Xiaowei R. Wang
To see and understand the countryside is a crucial part of moving towards a more livable future for everyone, says coder, artist and organizer Xiaowei R. Wang. They've observed that some of the most careful, thoughtful innovation is...
SciShow
Can Climate Change Make Lightning… Supercharged?
The oceans absorb a lot of CO2, leading to a variety of effects like ocean acidification. But you might not expect one of those effects: stronger lightning strikes.
Curated Video
Venice and the Ottoman Empire: Crash Course World History
In which John Green discusses the strange and mutually beneficial relationship between a republic, the citystate of Venice, and an Empire, the Ottomans--and how studying history can help you to be a better boyfriend and/or girlfriend....
Crash Course
How Are Cities Organized? Crash Course Geography
Today we’re going to take a closer look at cities, examine how these large complex structures are organized, and identify patterns and differences in land use around the world. We'll begin with a quick recap of Central Place Theory, then...
SciShow
Can Moon Colonies Get Oxygen From the...Moon?
As we look towards longer missions to the Moon, the shear amount of resources needed to survive becomes a much bigger question. Without space semi-trucks to haul life-giving resources to astronauts, can we utilize the Moon’s barren...
MinuteEarth
Should We Contact Uncontacted Peoples
FYI: We try to leave jargon out of our videos, but if you want to learn more about this topic, here are some handy keywords to get your googling started: - isolated peoples: peoples living without significant contact with global...
TED Talks
LaToya Ruby Frazier: A visual history of inequality in industrial America
For the last 12 years, LaToya Ruby Frazier has photographed friends, neighbors and family in Braddock, Pennsylvania. But though the steel town has lately been hailed as a posterchild of "rustbelt revitalization," Frazier's pictures tell...
TED-Ed
TED-ED: The past, present and future of the bubonic plague - Sharon N. DeWitte
The bubonic plague, which killed around 1/5 of the world's population in the 14th century, is still around today -- but it now claims only a few thousand lives each year. How did that number shrink so drastically? Sharon N. DeWitte...
TED-Ed
These salamanders snack on each other (but don't die) | Luis Zambrano
Axolotls are one of science's most studied animals. Why, you ask? These extraordinary salamanders are masters of regeneration: they can flawlessly regenerate body parts ranging from amputated limbs and crushed spines to parts of their...
Crash Course Kids
Up, Up & Away
So... what makes the wind? You might be surprised to learn that it has to do with two of Earth's spheres; The Hydrosphere and the Geosphere. In this episode of Crash Course Kids, Sabrina takes us to the beach to chat about how the wind...
SciShow
8 Beautiful, Weird, and Scary Things Ice Can Do
Frozen water molecules don’t seem to be all that interesting. But, these eight weird things that ice can do are truly mind-boggling. Chapters View all ICE SPIKES 0:40 FROST QUAKES 2:36 FROST FLOWERS: LAND 3:26 FROST FLOWERS: SEA ICE 4:22...
3Blue1Brown
Inverse matrices, column space and null space: Essence of Linear Algebra - Part 7 of 15
How do you think about the column space and null space of a matrix visually? How do you think about the inverse of a matrix?
TED-Ed
TED-Ed: The psychology behind irrational decisions - Sara Garofalo
Often people make decisions that are not "rational" from a purely economical point of view - meaning that they don't necessarily lead to the best result. Why is that? Are we just bad at dealing with numbers and odds? Or is there a...
TED Talks
TED: 100 solutions to reverse global warming | Chad Frischmann
What if we took out more greenhouse gases than we put into the atmosphere? This hypothetical scenario, known as "drawdown," is our only hope of averting climate disaster, says strategist Chad Frischmann. In a forward-thinking talk, he...
MinutePhysics
Why It's HARD To Land on Mars
This video is about why it's harder to successfully land spacecraft and landers and rovers on Mars than on Earth, or Venus, or the Moon, or Titan, or asteroids. It all comes down to atmospheric density! When there's no atmosphere, you...