Saving a millisecond can save your life in a computer game. This is the first mouse that can record macros-sequences of clicks and keystrokes for common moves, such as grabbing guns and
reloading-while you're playing. A built-in LCD provides instruction. Microsoft SideWinder Mouse $80; microsoft.com
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.