A passionate techie and a shrewd businessman, Bill Gates changed the world while leading Microsoft to dizzying success. Now he's doing it again with his own style of philanthropy and passion for innovation.
As a Pittsburgh youth besieged by racism in the crumbling remains of the steel economy, Bill Strickland should have been one of the Rust Belt's casualties. Instead, he discovered the potter's wheel, and the transforming power of fountains, irrepressible dreams, and the slide show.
Joel Levine studies the atmospheres of Earth and Mars, looking at their origin, evolution, structure and chemistry and climate change. He's the principal investigator of the proposed ARES Mars Airplane Mission.