Mark Perez's life-size Mousetrap rig is a 10-year labor of love. This Rube Goldbergian contraption sends a bowling ball through a bevy of component steps, all resulting in a two-ton bank safe dropping on the poor mouse's cheese. Or at least that's what supposed to happen—but if it ran perfectly every time, it wouldn't be quite as exciting, right? The semi-unsuccessful run in the video above was offset by Perez's very successful marriage proposal to his girlfriend before the action began (she plays the mouse in the show). Highly adorable.
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.