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What do you study? http://xvedio.in.net/xvidoes/ xvidoes.com  The helmets are manufactured by RCESA, a joint venture between the Cedar Rapids芒聙聯based Rockwell Collins and the Israeli company Elbit, and they cost more than $500,000 apiece. Each helmet is bespoke: a laser scans a pilot芒聙聶s head to ensure optical accuracy when his eyes interface with the display. To understand the sensory impact of an H.M.D., imagine if, instead of having a rearview mirror in your car, you saw the same imagery projected onto the inner surface of your sunglasses, along with data from the speedometer, tachometer, fuel gauge, and global-positioning system. Now imagine driving forward, and as your eyes glance down toward the pedals, the video feed in front of your eyes changes to reveal the road beneath the vehicle.