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Big Unknowns: what is dark matter

Matter as we know it accounts for less than 5% of the known universe – the rest remains something of a mystery. Photograph: ESO/VISTA/J. EMERSON / HANDOUT/EPA Click for a full size image Big Unknowns: what is dark matter? Matter ...

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Construction slump points to cooling economy

Photo: Shutterstock Click for a full size image Construction slump points to cooling economy Construction has slumped to its lowest level since 2010, and the US Fed remains divided on its next interest rate hike, writes Richard Holden. Construction accounts ...

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