Actually r4di0fly3r's motion-tracking turret probably won't keep intruders out. But it will startle them. And it will probably keep cats and dogs out from sheer terror of "OH GOD WHAT IS THAT." » 12/27/12 2:30pm 12/27/12 2:30pm

This has to be the coolest thing I will see today. I need at least two to stand guard by my apartment.

Not only does this currently uncased Portal » 5/10/12 12:00pm 5/10/12 12:00pm turret track its victims with a camera, but it can even shoot (non-lethally) at them. And it'll inquire after you if you've left its sights. The only thing left for…

Here's a lovely little Instructable that shows how to make a Portal turret out of our favorite plastic building bricks suitable for desk or headboard. Now you're thinking with elements. » 5/19/11 12:40pm 5/19/11 12:40pm

Complete with a red laser eye and motion-sensing sound bytes, video game replica prop master Ryan Palser's latest creation is only one assload of bullets away from being a really bad idea. » 5/09/11 1:20pm 5/09/11 1:20pm