TED Talks
TED: I don't want children -- stop telling me I'll change my mind | Christen Reighter
One in five women in the United States will not have a biological child, and Christen Reighter is one of them. From a young age, she knew she didn't want kids, in spite of the insistence of many people (including her doctor) who told her...
TED Talks
Steven Johnson: The Web as a city
Outside.in's Steven Johnson says the Web is like a city: built by many people, completely controlled by no one, intricately interconnected and yet functioning as many independent parts. While disaster strikes in one place, elsewhere,...
Crash Course
Controlling Bureaucracies: Crash Course Government and Politics
In which Craig Benzine tells you how we keep bureaucracy in check. So we've spent the last few episodes telling you all about what bureaucracies are and why they are formed. And throughout we've hinted about this ever-expanding power...
SciShow
Do Essential Oils Really Work? And Why?
What does the research say about what essential oils can actually do?
SciShow
What's Up With the 'Alien Megastructure?'
The Kepler space telescope found a star that randomly gets really dim, and some people are suggesting the star's being blocked by a huge alien structure. It's probably not aliens, though.
SciShow
Why Do I Have to Use a Number 2 Pencil?
Why do exams always tell you to use a number 2 pencil? What happens if you don't? Quick Questions explains!
SciShow
Why Do Earthworms Come Out After It Rains?
Scientists come up with lots of possible reasons why rain triggers earthworms mysterious behavior: popping out of the soil and getting stranded on the ground.
Curated Video
Congressional Elections: Crash Course Government and Politics
This week Craig Benzine talks about the importance of elections. But he isn’t going to focus on presidential elections, but instead those of the strongest part of our government: congressional elections. Craig will talk about the...
SciShow Kids
How Are Raisins Made?
Raisins are a sweet, healthy treat, but they have a big secret: they start out as grapes! And the story of how they go from big, juicy grapes to little, chewy raisins is super cool!
SciShow
Baumgartner's Super Sonic Dive
Hank acknowledges the amazing feat performed by Felix Baumgartner and answers many of your questions about why it is so amazing.
SciShow
5 Weird Reasons Not to Smoke
Hank gives you five MORE reasons why you should probably avoid smoking, or quit if you already smoke - in addition to those big ones you already know about. These are the weird reasons.
Bozeman Science
Biogeochemical Cycling
Paul Andersen explains how biogeochemical cycling is used to move nutrients from the environment into living material and back again. He explains the water cycle, the carbon cycle, the nitrogen cycle and the phosphorus cycle. He also...
SciShow
6 Ways Species Rely on Humans for Survival
Sometimes, a species has declined so dramatically that they require serious human intervention to ensure they don’t disappear forever. Here are six ways we’re using conservation and science to keep those species alive....
Chapters
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TED Talks
TED: How great leaders innovate responsibly | Ken Chenault
In times of uncertainty, leaders have a responsibility to inspire hope. Sharing hard-won wisdom, business leader Ken Chenault talks about what it takes to enact positive, enduring change -- and why it's more important than ever to invest...
Crash Course
Non-Human Animals: Crash Course Philosophy
Today we are taking all the things we have learned this year about doing philosophy and applying that to moral considerations regarding non-human animals. We’ll explore what philosophers like Peter Singer and Carl Cohen have to say about...
TED Talks
Iqbal Quadir: How mobile phones can fight poverty
Iqbal Quadir tells how his experiences as a kid in poor Bangladesh, and later as a banker in New York, led him to start a mobile phone operator connecting 80 million rural Bangladeshi -- and to become a champion of bottom-up development.
MinuteEarth
Why Are Adults Bad At New Languages?
Learning a new language as an adult is harder than doing so as a child because adults usually aren’t as invested and often use the wrong strategies.
TED Talks
TED: The love, forgiveness and healing fathers need | Charles C. Daniels, Jr.
Fathers have a profound impact on their children's lives, yet an estimated ten million kids in the US see their dads less than once a month. Through his advocacy and mental health center, therapist Charles C. Daniels, Jr. empowers...
Crash Course
Discrimination: Crash Course Philosophy
Is it OK to discriminate? Do you do it? Is it always wrong or are there cases where it can be acceptable? Today we’re talking through several tricky cases and different philosophical perspectives on this issue.
SciShow
A Brief History of Birth Control
Gym teacher Hank gives us the full story of the past, present, and future of birth control.
PBS
How Do You Measure the Size of the Universe?
The universe is HUGE. But, there is only so much of the universe we can ACTUALLY see, and if we wanted to measure that FINITE space, how would we do it? A gigantic ruler? One really long car ride? Or maybe it's something even more...
SciShow
What Happens If You Leave Your Contacts in for Too Long?
If you're wearing contacts, you might want to take a look at this.
TED Talks
TED: Why you think you're right -- even if you're wrong | Julia Galef
Perspective is everything, especially when it comes to examining your beliefs. Are you a soldier, prone to defending your viewpoint at all costs -- or a scout, spurred by curiosity? Julia Galef examines the motivations behind these two...
Crash Course
The Vikings! - Crash Course World History 224
In which John Green teaches you about Vikings! That's right, one of our most requested subjects, the Vikings, right here on Crash Course. So what's the deal with Vikings? Well, the stuff you've heard about them may not be true. The...