The first plastic boat anchor weighs less than two pounds yet holds small craft better than metal designs do. A small blade on its shank keeps it from resting on its back, so the tip digs deep. Price not set; cooperanchors.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.