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    • When Was Earth Last Struck by a Supernova?

      When Was Earth Last Struck by a Supernova?

      Scientific American· 1 hour 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...

    • Letters: How should Israel have reacted?

      Letters: How should Israel have reacted?

      Chicago Tribune· 2 hours ago

      How should Israel have reacted after the atrocities committed by Hamas on Oct. 7? If a cease-fire is implemented between Israel and Hamas, what assurance...

    • Attenborough's epic sign off

      Attenborough's epic sign off

      BBC News· 2 hours ago

      Watch David Attenborough's epic sign off as the acclaimed Planet Earth II came to its conclusion on Sunday night on BBC One.