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    • Have days on Earth always been 24 hours?

      Have days on Earth always been 24 hours?

      Live Science via Yahoo News· 4 days ago

      When the moon was made, Earth's day may have been shorter than 10 hours. | Credit: Image Source via Getty Images Once every 24 hours, ...

    • How to stare at the Sun, through art

      The Economist· 45 minutes ago

      Ignore that advice and the result may be burnt retinas and partial blindness. As solar power becomes an ever more important energy source around the world, here are seven artworks that also ...