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    • When Was Earth Last Struck by a Supernova?

      When Was Earth Last Struck by a Supernova?

      Scientific American· 2 days 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...

    • Types of Algae and Their Benefits

      Types of Algae and Their Benefits

      Health via Yahoo News· 5 days ago

      This sea vegetable is dark green to black and is sold in thin, dried sheets. Nori is harvested from the ocean, washed, chopped, pressed into sheets, and...