Your perfectly manicured lawn is good for more than croquet: The lawns in the U.S. could trap enough carbon every year to offset the emissions from burning 1.9 billion gallons of gasoline. Unfortunately, it takes seven billion gallons of water a day to keep these lawns lush. That’s why Jim Baird, a turf scientist at the University of California at Riverside, is bioengineering a grass that drinks less and still earns praise at your barbecue.
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.