“The group suggested the idea, which is nicknamed Block Access to Deny Entry (BlockADE), in a request for information that was spotted by io9. In short, it asks for a way to ‘construct a barrier without human intervention,’ meaning no touching anything. You just hit a button, or pull a tab and it should expand into a barrier that DARPA says would be ‘orders of magnitude’ in size. That barrier would then need to keep — or at least slow — somebody from getting through it using a saw or other hand tool. Better yet, DARPA suggests it could offer resistance from ballistic devices (like bullets or rockets), be see-through, and be reversible back down to a smaller state if need be.”

http://www.theverge.com/2014/6/21/5829024/darpa-wants-to-make-a-portable-bullet-resistant-wall-that-fits-in-a-can

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