Mary Lou Jepsen pushes the edges of what's possible in optics and physics, to make new types of devices, leading teams and working with huge factories that can ship vast volumes of these strange, new things.
Lee Smolin is a theoretical physicist, working mainly in the field of quantum gravity. He's a founding member of the Perimeter Institute for Theoretical Physics in Canada, and the author of The Trouble With Physics.
As a child growing up in North Korea, Hyeonseo Lee thoght her country was the "best on the planet." It wasn't until the famine of the 90s that she began to wonder. She escaped the country at 17-years-old to begin a life in hiding as a refugee in China. Hers is a harrowing, personal tale of survival and hope -- and a powerful reminder of those who face constant danger, even when the border is far behind.