Rebecca Saxe studies how we think about other people's thoughts. At the Saxelab at MIT, she uses fMRI to identify what happens in our brains when we consider the motives, passions and beliefs of others.
Ray Kurzweil is an engineer who has radically advanced the fields of speech, text and audio technology. He's revered for his dizzying -- yet convincing -- writing on the advance of technology, the limits of biology and the future of the human species.
Daniel Tammet is the author of "Born on a Blue Day," about his life with high-functioning autistic savant syndrome. He runs the language-learning site Optimnem, and his new book is "Embracing the Wide Sky: A Tour Across the Horizons of the Mind."
Michael Shermer debunks myths, superstitions and urban legends -- and explains why we believe them. Along with publishing Skeptic Magazine, he's author of Why People Believe Weird Things and The Mind of the Market.
Susan Blackmore studies memes -- those self-replicating "life forms" that spread themselves via human consciousness. We're now headed, she believes, toward a new form of meme, spread by the technology we've created.
Roberto D'Angelo and Francesca Fedeli created the social enterprise FightTheStroke.org to open up a dialogue about the devastating effects of strokes at a young age. This issue is important to them for a simple reason: because they've been through it themselves with their son Mario.
Marvin Minsky is one of the great pioneers of artificial intelligence -- and using computing metaphors to understand the human mind. His contributions to mathematics, robotics and computational linguistics are legendary and far-reaching.
Widely regarded as the world's most influential living psychologist, Daniel Kahneman won the Nobel in Economics for his pioneering work in behavioral economics -- exploring the irrational ways we make decisions about risk.
At age 12, Martin Pistorius fell into a coma, and spent 13 years locked inside his body, unable to communicate -- until a caregiver noticed his eyes responded to her. His book "Ghost Boy" tells his story.
Jeff Hawkins pioneered the development of PDAs such as the Palm and Treo. Now he's trying to understand how the human brain really works, and adapt its method -- which he describes as a deep system for storing memory -- to create new kinds of computers and tools.