• Question: what are we made of ?

    Asked by blaze to Ciarán on 21 Nov 2014.
    • Photo: Ciarán O'Brien

      Ciarán O'Brien answered on 21 Nov 2014:

      In terms of weight, we’re about 65% oxygen, 18% carbon, 10% hydrogen, 3% nitrogen, and the remaining 4% is made up of tiny amounts of exotic things like calcium, phosphorus, and almost every other element on the periodic table.

      Wikipedia has a few charts showing the average amount of a given substance in the human body:
      http://en.wikipedia.org/wiki/Composition_of_the_human_body

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