Neil deGrasse Tyson

Carl Sagan spoke fluently between biology and geology and astrophysics and physics. If you move fluently across those boundaries, you realize that science is everywhere; science is not something you can step around or sweep under the rug.

Those who see the cosmic perspective as a depressing outlook, they really need to reassess how they think about the world. Because when I look up in the universe, I know I'm small but I'm also big. I'm big because I'm connected to the universe, and the universe is connected to me.

The thing I always liked best about touring abroad was constantly running into different people, different cultures, different foods. It really pumped up my batteries... I'm constantly playing to a demographically diverse audience... one generation is driven by nostalgia, the next by curiosity. And that's why I have no plans to retire.