This design for a retractable doorknob provides extra security for your door by recessing into the doorframe when you leave the house, thereby preventing thieves from picking your lock (there are none). But if you want to get in, you use (we're assuming) the little slot below the knob to extend the knob out so you can turn and open the door. It's all very futuristic and confusing, but still won't stop FBI agents from kicking down your door. [Yanko Design via Geekologie via Sci Fi]
Retractable Doorknobs Provide Turtle-like Security
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Researchers Made 25-Ton Boulders They Can Move By Hand, Giving More Insights Into Ancient Engineering
How were giant ancient structures like Stonehenge, or the towering Moai heads on Easter Island, assembled at a time when cranes and trucks were still hundreds of years away? Researchers at MIT have given more credence to theories that ancient engineers were masters of balance and leverage with a new experiment that produced giant concrete structures, some 25-tons in weight, that can be still be manoeuvred by hand.