
Top thinkers and scientists speak to today's global concerns.
Physicist Sean Carroll shares observations about the relationship between humanity and the laws of nature.
Doris Kearns Goodwin, writer and presidential biographer, provides leadership lessons that can be used to live the fullest and most successful lives.
Cosmologist Max Tegmark uses the physics, astronomy and mathematics that are the foundation of his work to address some of the greatest mysteries.
Alan Stern discusses how New Horizons took its famed look at Pluto and is now racing toward its next destination.