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    • Nadal to open French Open against Zverev

      Nadal to open French Open against Zverev

      The Journal Times· 1 day ago

      Rafael Nadal is in the French Open field, after all, and Thursday's draw set up the 14-time champion for a challenging first-round matchup against No. 4...

    • When Was Earth Last Struck by a Supernova?

      When Was Earth Last Struck by a Supernova?

      Scientific American· 11 hours ago

      In this case, a supernova within about 160 light-years, or 1.5 quadrillion kilometers, would qualify. Iron 60 is a radioactive isotope of iron that...