Siegfried Woldhek knows faces -- he's drawn more than 1,100 of them. Using sophisticated image analysis and his own skills as an artist, he's come up with a fascinating discovery about Leonardo Da Vinci.
Brewster Kahle is an inventor, philanthropist and digital librarian. His Internet Archive offers 85 billion pieces of deep Web geology -- a fascinating look at the formation of the Internet over the years, and a challenge to those who would keep knowledge buried.
Surely not the only science career based on a museum tour epiphany, Paul Sereno's is almost certainly the most triumphant. He's dug up dinosaurs on five continents -- and discovered the world's largest crocodile, the (extinct) 40-foot Sarchosuchus.
A leader in the emerging field of graphic recording, Sam Hester creates visual stories. Her work draws upon deep listening skills, a unique graphic style, a passion for community-building … and a lot of markers.
Kary Mullis won the Nobel Prize in Chemistry for developing a way to copy a strand of DNA. (His technique, called PCR, jump-started the 1990s' biorevolution.) He's known for his wide-ranging interests -- and strong opinions.
In David Hoffman's long film career, he's made documentaries on everything from Amelia Earhardt to B.B. King, from double-dutch jump-roping to F-15 fighter pilots. Lately he's been fascinated with the early space program and our mania for all things Sputnik.