How did supermassive black holes grow so fast?
(PHYSorg.com Space & Earth)

Black holes in the early universe pose a bit of a problem. Based on observations from telescopes on Earth and in space, we know that some black holes grew to be a billion times the mass of the sun just one billion years after the Big Bang. Our current models of black hole growth, however, can`t explain this speed of growth. So how did these supermassive black holes come about?