Named to Wired Magazine’s Smart List, and a two-time TED speaker, William Gurstelle is a bestselling author, magazine writer, and professional speaker. He is a contributing editor at Popular Science and Make magazines.
Citizen scientists 'flock' to Nebraska to witness the annual migration
This international program encourages volunteers to share their city with tourists
Jim Owen wants to convince everyone else – one step (or lunge or squat) at a time