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The hybrid disc works by making the Blu-ray layer act like a two way mirror, reflecting enough light for Blu-ray playback, but letting enough light through for HD DVD operation.
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It becomes like a funhouse mirror, strangely reflecting the humans looking into it.
CNN: 'Sphere' takes moviegoers to new depths
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And when its aluminium coating is replaced with silver in a year or two's time (a huge vacuum-chamber housed at the telescope's base will be used to deposit metallic vapour on to the mirror's reflecting surface), it will be able to see into the infra-red with equal clarity, opening up a much neglected area of astronomy.
ECONOMIST: Japan��s new telescope