700 million people still live without electricity. Here’s how to fix that | Jacqueline Novogratz

“Building a 30-foot-high concrete structure from sea to shining sea is the most expensive and least effective way to do border security,” says Congressman Will Hurd, a Republican from Texas whose dist...

26 Sep 201917min

Genealogist Yaniv Erlich helped build the world’s largest family tree -- comprising 13 million people and going back more than 500 years. He shares fascinating patterns that emerged from the work -- a...

25 Sep 20199min

As a sex educator, Emily Nagoski is often asked: How do couples sustain a strong sexual connection over the long term? In this funny, insightful talk, she shares her answer -- drawing on (somewhat sur...

24 Sep 201910min

“Girls’ education is the closest thing we have to a silver bullet to help solve some of the world’s most difficult problems,” says social entrepreneur Safeena Husain. In a visionary talk, she shares h...

23 Sep 201910min

“Doctor, is this really necessary?” Backed by startling statistics about overtreatment, neurosurgeon Christer Mjåset explains the power of this and other simple questions in the context of medical tre...

19 Sep 201910min

To study a system as complex as the entire universe, astrophysicists need to be experts at extracting simple solutions from large data sets. What else could they do with this expertise? In an interdis...

17 Sep 20195min

Rising carbon levels in the atmosphere can make plants grow faster, but there’s another hidden consequence: they rob plants of the nutrients and vitamins we need to survive. In a talk about global foo...

16 Sep 201910min

Rising inequality and growing political instability are the direct result of decades of bad economic theory, says entrepreneur Nick Hanauer. In a visionary talk, he dismantles the mantra that "greed i...

13 Sep 201917min