@TheEconomist : Chop-chop: why does this helicopter have two rotors on top? http://t.co/qWxGYdwlEu http://t.co/sEVJAr2K9f

Authors: Ecroaker Investors

TheEconomist @TheEconomist : Chop-chop: why does this helicopter have two rotors on top? http://t.co/qWxGYdwlEuhttp://t.co/sEVJAr2K9f

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