Hank explores different ways of understanding identity – including the Indiscernibility of Identicals, and essential and accidental properties. In what ways does affect identity? In what ways does it not? What does it mean for a thing to...

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.

How does bitcoin work? What is a "block chain"? What problem is this system trying to solve, and how does it use the tools of cryptography to do so?

Humans are great at creating, and solving, problems. Hank talks with Gina McCarthy about the biggest public health problem we face today: climate change. Gina McCarthy is the Director of C-CHANGE (Center for Climate, Health and the...

The development of agriculture was a huge game changer for human beings and it may have even changed the way we speak.

The financial sector often talks of decarbonizing investment portfolios as a way to fight climate change. But portfolios can be "cleaned" without having any real impact on the problem, says investment expert Nili Gilbert. Bringing...

How exactly does gender work? It's not just about our chromosomes, says biologist Karissa Sanbonmatsu. In a visionary talk, she shares new discoveries from epigenetics, the emerging study of how DNA activity can permanently change based...

Real World Telekinesis (feat. Neil Turok)

Be spreaders of facts and truths, says scientist and immunologist Dr. Anthony Fauci. Having advised seven US presidents on various disease outbreaks including COVID-19, he shares insights on the present and future of pandemics, backed up...

Given the option, few would choose to buy products that harm the earth -- yet it's nearly impossible to know how most consumer goods are made or where they're sourced from. That's about to change, says supply chain innovator Markus Mutz....

So, variables. There are lots of them when trying to test an idea. The trick is to isolate one variable at a time to get reliable results every time. But, how do we do that? In this episode of Crash Course Kids, Sabrina shows us how to...

Today, we're going to explore the world of role-playing games. Role-playing games are different than most, because they're technically a form of interactive storytelling with one player managing the game as the game master (or dungeon...

This video is about the famous 'Twins paradox' of special relativity, how time can appear to be faster for two different observers at the same time, and which twin really is older (or younger) - the one who stays on earth or the one who...

How is it that a breathalyzer can measure the alcohol content in someone’s blood, hours after they had their last drink, based on their breath alone? And could we use this same technology to detect disease by analyzing a person’s...

The UN predicts that antimicrobial resistance will be our biggest killer by 2050. "That should really scare the hell out of all of us," says bioprocess engineer Leon Marchal. He's working on an urgently needed solution: transforming the...

Jessi has a secret message she wants to share with Squeaks, but first they'll need to use some special ingredients to reveal it.

How does bitcoin work? What is a "block chain"? What problem is this system trying to solve, and how does it use the tools of cryptography to do so?

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. In an emotionally charged talk, MacArthur-winning activist Majora Carter details her fight for environmental...

Scientists are working on creating organisms with designer genomes -- and someday, we might end up with bacteria manufacturing our jet fuel.

One potential avenue for cancer treatment uses electricity not from any outside machine, but from within our own bodies.

This video is about how we don't just need energy to power our lives, we need *low entropy* energy! Thanks to Google Making and Science for supporting this series, and to Sean Carroll for collaborating on it!...

We've talked about variables and solving problems. But how do we keep working on a problem if the first solution doesn't fix it? Trials! In this episode of Crash Course Kids, Sabrina shows us how to use Trials to figure out what the...

While news from Iran streams to the world, Clay Shirky shows how Facebook, Twitter and TXTs help citizens in repressive regimes to report on real news, bypassing censors (however briefly). The end of top-down control of news is changing...

In this video Paul Andersen explains how a spontaneous process may take either the thermodynamically controlled or the kinetic controlled pathway. If the activation energy determines the path taken then the process is under kinetic...