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Scientists call their discovery a 'perfect' invisibility cloak

Functional "cloaking" devices have been around since 2006, but they're far from perfect. All attempts so far have failed to avoid at least some partial light and reflectivity — what has resulted in an unconvincing effect. Part of the problem is finding a way to hide objects in wavelengths longer than the human eye… » 11/12/12 8:00am 11/12/12 8:00am