Using its near-infrared vision to peer 9 billion years back in time, NASA’s Hubble Space Telescope has uncovered an extraordinary population of tiny, young galaxies that are brimming with star formation. Most of these galaxies are a hundred times less massive than the Milky Way, yet they churned out stars at a furious pace. However, it’s a mystery why these newly found dwarf galaxies were making batches of stars at such a high rate.
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"Twinning" is genetic and the central African country of Benin has the highest twin birthrate, while Asia and Latin America have much lower rates of twinning. Benin has almost 30 twins for every 1,000 births. Europe, the US and Australia–where most maternal genes are the same–average nine to 16 sets of twins for every 1,000 births.
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