Symmetric keys are essential to encrypting messages. How can two people share the same key without someone else getting a hold of it? Upfront asymmetric encryption is one way, but another is Diffie-Hellman key exchange.

From helping build smart cities to supporting the sustainable energy sector, the possibilities of big data are endless. But many companies are still wary of sharing data that could expose them to risk and diminish their competitive...

Join Jessi and Squeaks as they answer questions in the first viewer mail episode from SciShow Kids!

As the saying goes, less is more. The same goes for words. Listen as Politico and Axios co-founder Jim VandeHei shares what he's learned leading two media companies -- and how to radically rethink the way you write to keep people's...

Artist Kate Hartman uses wearable electronics to explore how we communicate, with ourselves and with the world. In this quirky and thought-provoking talk, she shows the "Talk to Yourself Hat", the "Inflatable Heart", the "Glacier...

The origin story of turtles is a mystery that has perplexed many for centuries, but thanks to more recent studies, we might be one step closer to figuring out their lineage.

We face an endless string of choices, which leads us to feel anxiety, guilt and pangs of inadequacy that we are perhaps making the wrong ones. But philosopher Renata Salecl asks: Could individual choices be distracting us from something...

Here we break down Asymmetric crypto and more.

Joe Gebbia, the co-founder of Airbnb, bet his whole company on the belief that people can trust each other enough to stay in one another's homes. How did he overcome the stranger-danger bias? Through good design. Now, 123 million hosted...

Teachers emotionally support our kids -- but who's supporting our teachers? In this eye-opening talk, educator Sydney Jensen explores how teachers are at risk of "secondary trauma" -- the idea that they absorb the emotional weight of...

If you're undergoing surgery, you want the best surgical team to collaborate on your case, no matter where they are. Surgeon and entrepreneur Nadine Hachach-Haram is developing a new system that helps surgeons operate together and train...

More than half of the world's population already lives in cities, and another 2.5 billion people are projected to move to urban areas by 2050. The way we build new cities will be at the heart of so much that matters, from climate change...

The Gaia space observatory released a detailed 3d map of the Milky Way, and scientists have figured out why Charon's north pole is red!

Having feelings isn't a sign of weakness -- they mean we're human, says producer and activist Nikki Webber Allen. Even after being diagnosed with anxiety and depression, Webber Allen felt too ashamed to tell anybody, keeping her...

Paul Andersen explains a viral replication simulation that he created for his AP Biology class. He used Google docs to keep track of viral strains, Moodle messaging to pass the virus from student to student, and dice to generate...

Throughout her career in banking Ilona Szabó de Carvalho never imagined she'd someday start a social movement. But living in her native Brazil, which leads the world in homicidal violence, she realized she couldn't just stand by and...

The majority of us can probably agree that the sound of nails on a chalkboard is unpleasant, but why is that? Theories range from evolutionary survival mechanisms to the anatomy of the human ear. Find out more in this episode of SciShow!

There is a mind-boggling amount of data floating around our society. Physicists at CERN have been pondering how to store and share their ever more massive data for decades - stimulating globalization of the internet along the way, whilst...

The nuclear family model may no longer be the norm in the US, but it's still the basis for social and economic benefits like health care, tax breaks and citizenship. Lawyer and LBGTQIA advocate Diana Adams believes that all families,...

Both spells and music were born from a freely available folk culture, but are now sold as commercial goods. There are thousands of artists (and witches!) trying to figure out how to make a living in an age where their products can be...

For a crime he committed in his early twenties, the courts sentenced Marlon Peterson to 10 years in prison -- and, as he says, a lifetime of irrelevance. While behind bars, Peterson found redemption through a penpal mentorship program...

A unique ecosystem of plants, birds and monkeys thrives in the treetops of the rainforest. Nalini Nadkarni explores these canopy worlds -- and shares her findings with the world below, through dance, art and bold partnerships.

Why is China appointing thousands of judges to environmental courts and training prosecutors to bring cases to them, even if it means suing the government? Eco-lawyer James Thornton takes us inside the country's growing effort to use the...

The people behind fake posts can rely on a few tricks to get you on board. But there are ways to spot them, and ways to avoid falling for what they have to say.