Unlock the inner workings of the world through one of the most imaginative art forms ever: mathematics. Roger Antonsen explains how a change in perspective can reveal patterns, numbers and formulas -- and create understanding of what was once a mystery. Watch »

In this lucid explainer of a complex technology (that might just change everything), Bettina Warburg describes how the blockchain will eliminate the need for banks and governments to facilitate trade. Age-old models of commerce and finance are about to change. Watch »

Now more than ever, it's important to look boldly at the reality of race and gender bias -- and how they can combine. Kimberlé Crenshaw uses the term "intersectionality" to describe this phenomenon; as she says, if you're standing in the path of multiple forms of exclusion, you're likely to get hit by both. In this deeply moving talk, she calls on us to bear witness -- and speak up for victims of prejudice. Watch »

Let's define our students by what they can contribute, not what they lack, says educator Victor Rios. Sharing his own story of perseverance as an inner-city kid, Rios shares three ways we can shift attitudes about students who face challenges and risks -- so we can focus on their promise, resilience, character and grit. Watch »