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    • Hematemesis (Vomiting Blood)

      Hematemesis (Vomiting Blood)

      Health via Yahoo News· 8 hours ago

      Hemoglobin is a protein in red blood cells that helps carry oxygen throughout the body. Additional tests, such as liver function tests or blood clotting...

    • Why alien life might look purple

      Why alien life might look purple

      National Geographic· 3 days ago

      In a 2018 study, researchers concluded that purple archaea, another type of microorganism that uses a molecule called retinal to photosynthesize, could...