After launching their smaller Falcon 1 last summer (the first privately-developed liquid-fuel rocket ever to reach orbit), SpaceX is now ready for the first test launch of its larger, more advanced Falcon 9 rocket today. A four-hour, weather-dependent launch window begins now, and you can watch the countdown live. Update: Looks like the test was successful.
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.