Due to a technical issue, we're not going to activate the "price-freeze" feature on PPX until Friday, July 6. So from now until that day, trades will continue to happen in real time, with no opening-bell effect. Please make a note of the schedule change.
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.