TED Talks Daily (SD video)

Why do some people do selfless things, helping other people even at risk to their own well-being? Psychology researcher Abigail Marsh studies the motivations of people who do extremely altruistic acts, like donating a kidney to a complete stranger. Are their brains just different?

Architecture is more than a clever arrangement of bricks. In this eloquent talk, Michael Murphy shows how he and his team look far beyond the blueprint when they're designing. Considering factors from airflow to light, theirs is a holistic approach that produces community as well as (beautiful) buildings. He takes us on a tour of projects in countries such as Rwanda and Haiti, and reveals a moving, ambitious plan for The Memorial to Peace and Justice, which he hopes will heal hearts in the American South.

"We're not in a clean energy revolution; we're in a clean energy crisis," says climate policy expert Michael Shellenberger. His surprising solution: nuclear. In this passionate talk, he explains why it's time to overcome longstanding fears of the technology, and why he and other environmentalists believe it's past time to embrace nuclear as a viable and desirable source of clean power.

By loading kids with high expectations and micromanaging their lives at every turn, parents aren't actually helping. At least, that's how Julie Lythcott-Haims sees it. With passion and wry humor, the former Dean of Freshmen at Stanford makes the case for parents to stop defining their children's success via grades and test scores. Instead, she says, they should focus on providing the oldest idea of all: unconditional love.

What happens when the way we buy, sell and pay for things changes, perhaps even removing the need for banks or currency exchange bureaus? That's the radical promise of a world powered by cryptocurrencies like Bitcoin and Ethereum. We're not there yet, but in this sparky talk, digital currency researcher Neha Narula describes the collective fiction of money -- and paints a picture of a very different looking future.

At the intersection of medical invention and indigenous culture, pediatric cardiologist Franz Freudenthal mends holes in the hearts of children across the world, using a device born from traditional Bolivian loom weaving. "The most complex problems in our time," he says, "can be solved with simple techniques, if we are able to dream."

What is a concussion? Probably not what you think it is. In this talk from the cutting edge of research, bioengineer (and former football player) David Camarillo shows what really happens during a concussion -- and why standard sports helmets don't prevent it. Here's what the future of concussion prevention looks like.

For the first time in history, the majority of American parents don't think their kids will be better off than they were. This shouldn't be a cause for alarm, says journalist Courtney Martin. Rather, it's an opportunity to define a new approach to work and family that emphasizes community and creativity. "The biggest danger is not failing to achieve the American Dream," she says in a talk that will resonate far beyond the US. "The biggest danger is achieving a dream that you don't actually believe in."

Would you choose to build a house on top of an unfinished foundation? Of course not. Why, then, do we rush students through education when they haven't always grasped the basics? Yes, it's complicated, but educator Sal Khan shares his plan to turn struggling students into scholars by helping them master concepts at their own pace.

It happens to all of us: you unsubscribe from an unwanted marketing email, and a few days later another message from the same company pops up in your inbox. Comedian James Veitch turned this frustration into whimsy when a local supermarket refused to take no for an answer. Hijinks ensued.

Global problems such as terrorism, inequality and political dysfunction aren't easy to solve, but that doesn't mean we should stop trying. In fact, suggests journalist Jonathan Tepperman, we might even want to think riskier. He traveled the world to ask global leaders how they're tackling hard problems -- and unearthed surprisingly hopeful stories that he's distilled into three tools for problem-solving.

"When you talk to strangers, you're making beautiful interruptions into the expected narrative of your daily life -- and theirs," says Kio Stark. In this delightful talk, Stark explores the overlooked benefits of pushing past our default discomfort when it comes to strangers and embracing those fleeting but profoundly beautiful moments of genuine connection.

Why is it so hard to find female superhero merchandise? In this passionate, sparkling talk, media studies scholar (and father of a Star Wars-obsessed daughter) Christopher Bell addresses the alarming lack of female superheroes in the toys and products marketed to kids -- and what it means for how we teach them about the world.

Are you setting out to change the world? Here's a stat you should know: nonviolent campaigns are 100 percent more likely to succeed than violent ones. So why don't more groups use nonviolence when faced with conflict? Filmmaker Julia Bacha shares stories of effective nonviolent resistance, including eye-opening research on the crucial leadership role that women play.

Vanessa Ruiz takes us on an illustrated journey of human anatomical art over the centuries, sharing captivating images that bring this visual science -- and the contemporary artists inspired by it -- to life. "Anatomical art has the power to reach far beyond the pages of a medical textbook," she says, "connecting our innermost selves with our bodies through art."