1. CLEAR THE REAR Clear taillights became popular because of their simplicity-customizers found the existing mix of red, white, and amber distracting. Sets from American Products Co. fit most small cars (prices vary); be sure to install tinted bulbs so the lights glow red or amber. www.4apc.net
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.