Who needs keys when you can just give your door the finger? Thanks to boffins in Taiwan, you don't any more.
Pretty much summed up in Undercover Brother, minus the hand, the idea is you pull your unique hand gesture in front of a 3D positional sensor, which'll then unlock your door for you. Give your door the finger and it unlocks hey-presto! Just make sure your nosy neighbours aren't watching -- don't want them copying you and busting through the door to ransack your pad after you put a football through their window the other weekend. [PhysOrg via Geek]