Henri Picciotto: Can you solve the fortress riddle?
Bad news: your worst enemies are at the gate. Your fledgling kingdom guards the world's only herd of tiny dino creatures. To you, they're sacred. To everyone else, they're food. The three closest nation-states have teamed up to smash open your walls and devour the herd. Can you build fortifications for your kingdom before the siege weapons arriv...
Dina Katabi: A new way to monitor vital signs (that can see through walls)
At MIT, Dina Katabi and her team are working on a bold new way to monitor patients' vital signs in a hospital (or even at home), without wearables or bulky, beeping devices. Bonus: it can see through walls. In a mind-blowing talk and demo, Katabi previews a system that captures the reflections of signals like Wi-Fi as they bounce off people, cre...
Dina Zielinski: How we can store digital data in DNA
Mike Brady and Dion Drew: Why we hire "unemployable" people
Trips to a bakery always ends with a cookie and a smile -- but at the bakery run by Mike Brady and Dion Drew, the extra icing is their goal of serving up a second chance. The recipe for the success of their enterprise includes a commitment to employing a range of chronically unemployed people, including former convicts and recovering addicts.
Dana Kanze: The real reason female entrepreneurs get less funding
Women own 39 percent of all businesses in the US, but female entrepreneurs get only two percent of venture funding. What's causing this gap? Dana Kanze shares research suggesting that it might be the types of questions start-up founders get asked when they're invited to pitch. Whether you're starting a new business or just having a conversation,...
Dan Finkel: This one weird trick will get you infinite gold
A few years ago, the king decided your life would be forfeit unless you tripled the gold coins in his treasury. Fortunately, a strange little man appeared and magically performed the feat. Unfortunately, you promised him your first-born child in exchange for his help — and today he's come to collect. Can you figure out how to outsmart the man an...
Danny Hillis: Understanding cancer through proteomics
Danny Hills makes a case for the next frontier of cancer research: proteomics, the study of proteins in the body. As Hillis explains it, genomics shows us a list of the ingredients of the body -- while proteomics shows us what those ingredients produce. Understanding what's going on in your body at the protein level may lead to a new understandi...
Dan Gross: Why gun violence can't be our new normal
It doesn't matter whether you love or hate guns; it's obvious that the US would be a safer place if there weren't thousands of them sold every day without background checks. Dan Gross, president of the Brady Campaign to Prevent Gun Violence, makes a passionate, personal appeal for something that more than 90 percent of Americans want: background...
Daan Roosegaarde: A smog vacuum cleaner and other magical city designs
Daan Roosegaarde uses technology and creative thinking to produce imaginative, earth-friendly designs. He presents his latest projects -- from a bike path in Eindhoven, where he reinterpreted "The Starry Night" to get people thinking about green energy, to Beijing, where he developed a smog vacuum cleaner to purify the air in local parks, to a d...
Dan Finkel: Can you solve the giant spider riddle?
Once every century, the world's greatest spiders gather to compete in a series of grueling games. The winner will become the next arachnomonarch, able to command all the world's spiders to their will. That day is today, and for the first time, you're casting your name into the ring. Can you attain the mantle of spider supremacy? Dan Finkel shows...
Dan Reisel: The neuroscience of restorative justice
Dan Reisel studies the biology of change, including our ability to rewire our own brains. And he asks a big question: Instead of warehousing these criminals, shouldn't we be using what we know about the brain to help them rehabilitate? Put another way: If the brain can grow new neural pathways after an injury ... could we help the brain re-grow ...
Dan Finkel: Can you solve the secret werewolf riddle?
You're on the trail of a werewolf that's been terrorizing your town. After months of detective work, you've narrowed your suspects to one of five people. You've invited them to dinner with a simple plan: to slip a square of a rare antidote into each of their dinners. Unfortunately, you only have one square left. Can you divide it into perfect fi...
Diana Laufenberg: How to learn? From mistakes
Dan Meyer: Math class needs a makeover
Dan Phillips: Creative houses from reclaimed stuff
Dean Ornish: The killer American diet that's sweeping the planet
Tina Yong: The rise of the "trauma essay" in college applications
As if college applications aren't stressful enough, disadvantaged youth are often encouraged to write about their darkest traumas in their admissions essays, creating a marketable story of resilience that turns "pain into progress," says politics student Tina Yong. She brings this harrowing norm to light, exploring its harms and offering a more ...
Tania Luna: How a penny made me feel like a millionaire
As a young child, Tania Luna left her home in post-Chernobyl Ukraine to take asylum in the US. And one day, on the floor of the New York homeless shelter where she and her family lived, she found a penny. She has never again felt so rich. A meditation on the bittersweet joys of childhood -- and how to hold them in mind.
Dan Gartenberg: The brain benefits of deep sleep -- and how to get more of it
There's nothing quite like a good night's sleep. What if technology could help us get more out of it? Dan Gartenberg is working on tech that stimulates deep sleep, the most regenerative stage which (among other wonderful things) might help us consolidate our memories and form our personalities. Find out more about how playing sounds that mirror ...
Dan Kwartler: What causes insomnia?
What keeps you up at night? Pondering deep questions? Excitement about a big trip? Stress about unfinished work? What if the very thing keeping you awake was stress about losing sleep? This seemingly unsolvable loop is at the heart of insomnia, the world's most common sleep disorder. So what is insomnia? And is there any way to break the cycle? ...
Tony Buffington: Why do cats act so weird?
They're cute, they're lovable, and judging by the 26 billion views on over 2 million YouTube videos of them, one thing is certain: cats are very entertaining. But their strange feline behaviors, both amusing and baffling, leave many of us asking: Why do cats do that? Tony Buffington explains the science behind some of your cat's strangest behavi...
Dena Simmons: How students of color confront impostor syndrome
As a black woman from a tough part of the Bronx who grew up to attain all the markers of academic prestige, Dena Simmons knows that for students of color, success in school sometimes comes at the cost of living authentically. Now an educator herself, Simmons discusses how we might create a classroom that makes all students feel proud of who they...
Tina Seelig: The little risks you can take to increase your luck
Luck is rarely a lightning strike, isolated and dramatic -- it's much more like the wind, blowing constantly. Catching more of it is easy but not obvious. In this insightful talk, Stanford engineering school professor Tina Seelig shares three unexpected ways to increase your luck -- and your ability to see and seize opportunities.
Tan Le: How does the brain work in everyday situations?
Tien Nguyen: How do pregnancy tests work?
Over-the-counter pregnancy tests give potentially life-changing results with a pretty high rate of accuracy. But how do they work? Tien Nguyen explains how each test performs a scientifically rigorous, multi-stage experiment that goes from start to finish in the time that it’ll take you to watch this video. [Directed by Andrew Foerster, narrated...
Dan Schulman: What COVID-19 means for the future of commerce, capitalism and cash
Capitalism needs an upgrade, says PayPal CEO Dan Schulman, and it starts with paying people enough to actually invest in their futures. He discusses why companies need to cultivate trust to recover and rebuild after the COVID-19 pandemic -- and how we can use this defining moment to create a more inclusive, ethical economy. (This virtual convers...
Dan Kwartler: The myth of Gawain and the Green Knight
It was Christmas in Camelot and King Arthur was throwing a party. In the midst of the revelry, a towering knight proposed a game. He challenged the warriors present to attack him with his own axe. If they could strike him down, they would win his powerful weapon. However, he would be allowed to return the blow in one year. Dan Kwartler details t...
Danny Hillis: Should we create a solar shade to cool the earth?
Dean Kamen: To invent is to give
Dan Bell: Inside America's dead shopping malls