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Nothing can be fully transparent, physicists discover
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Nothing can be fully transparent, physicists discover

Here’s a fascinating twist: physicists have found that no material can be completely transparent. A subtle quantum process can turn light waves into sound waves, gradually draining energy from the light as it travels through matter. Even an ideal superfluid could let light cross the diameter of Earth before it noticeably dims, so the effect can be extraordinarily small. The finding suggests that perfect transparency may be out of reach, but materials can still come remarkably close.
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