Military engineers concentrate on creating new weapons for the battlefield.

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New digital technologies allow everyone to be a guitar hero.

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Soldiers in battle wear many pounds of protective gear. But that protection isn’t perfect. Those who survive bomb blasts often suffer brain trauma, resulting in symptoms ranging from memory loss to blurred vision.But Shu Yang, a University of Pennsylvania materials engineer, has developed a crystal patch that changes color when hit by a shock wave. The resulting color can indicate the severity of the blast.

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Harvard University engineer Robert Wood is developing a robotic fly. Propelled by tiny, flapping wings, the microrobot (right) weighs no more than a few grains of rice and flits about just like a real fly. It’s pretty cute, but it’s also a deadly serious device.

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When Apple’s engineers created the iPhone (right) a few years ago, it was an immediate hit, despite a fat price tag. Not only was it a cell phone but an iPod-like music and video player, too. It could surf the Web, handle e-mails, and receive GPS signals. Plus, it looked great and had touch-screen control.

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