Looking for evidence of dark matter

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Beneath a mountain, an experiment is about to begin that could prove the existence of some of the strangest particles known to science.

Physicists are hoping to find the first evidence of dark matter - a hidden substance that is thought to pervade the Earth and the Universe.

BBC World Service science reporter Rebecca Morelle has been to Italy to take a look inside the Darkside50 experiment at the Gran Sasso National Laboratory before it is switched on.

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