Free Key is a brilliantly simple upgrade to the standard key ring design. It features three layers of metal, with the middle layer having a small bump. You push the top layer down over this bump to give the metal some leverage. The end of the key ring then lifts up easily, giving you room to slip your key right in there with no need to involve your poor fingernails at all.
The pentagon has been said to work on robotic spying insects and has probably tried rat-mounted cameras, but this maple seed camera is one of the most interesting project to date. Lockheed Martin has been awarded a contract to develop this device. The final version would contain an engine, telemetry, imaging sensors and… power of course. :