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Particles of invisible "dark matter" have been detected deep inside a mountain in Italy, a collaboration of Italian and Chinese physicists claims. But others remain sceptical of the result, because other experiments have failed to detect any dark matter at all.

On Wednesday 16 April, at a workshop in Venice, Italy, the Dark Matter (DAMA) collaboration announced the results of the 4-year second phase of its experiment. DAMA scientists claimed to see dark matter back in 2003, but some scientists believed the result was a quirk of statistics. Now the evidence is stronger.