Lord Martin Rees, one of the world's most eminent astronomers, is an emeritus professor of cosmology and astrophysics at the University of Cambridge and the UK's Astronomer Royal. He is one of our key thinkers on the future of humanity in the cosmos.
Ron Eglash is an ethno-mathematician: he studies the way math and cultures intersect. He has shown that many aspects of African design -- in architecture, art, even hair braiding -- are based on perfect fractal patterns.
Roz Savage gave up her life as a management consultant to row across the Atlantic in 2005. Her mission now is to row across the Pacific, from the West Coast to Australia, raising awareness along the way of plastic pollution, climate change and eco-heroism.