In physical space, there is a huge difference between an original and a copy of something.

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Two rival metering models used in large commercial buildings to track the flow of electricity as it moves through a building shows the difference between upstream and downstream applications in the smart-grid space.

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In a market like the US, where the top two manufacturers can dominate shelf space in retail outlets, that could make a big difference to its overall sales.

ECONOMIST: Bitter sweet | The

St Mirren boast a superior goal difference to Killie, but MacPherson is frustrated that his side did not give themselves more breathing space in the fight against the drop.

BBC: St Mirren manager Gus MacPherson

"There's no physical difference in the moon, " said Noah Petro, scientist for the Lunar Reconnaissance Orbiter at NASA's Goddard Space Flight Center in Greenbelt, Maryland.

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