A brand-new challenge from InnoCentive has a massive payday--a whopping $160,000 from the U.S. Environmental Protection Agency and the Department of Health and Human Services for your ideas on ways to detect and help solve air pollution. It's open to any individual, team, or business in the United States with a killer idea about using new mobile tech to sense pollutants--it's an issue with huge public health implications, and we know that PopSci readers are just the people to help address it. Read more about it at InnoCentive.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.