Transcript: Most stars are very different in chemical composition from you, or I, or the material on the Earth. The Sun for example, of every 10 thousand atoms has 74 hundred hydrogen atoms, 24 hundred helium atoms, and 150 or so corresponding to all the other elements in the periodic table; for example, there are only three carbon atoms, two nitrogen atoms, and five oxygen atoms out of that 10 thousand. Contrast that with human material which of course is mostly water. Out of every 10 thousand atoms in the human body 62 hundred are hydrogen, 11 hundred carbon, 200 nitrogen, and 25 hundred oxygen; only two are helium. Humans have vastly more carbon, nitrogen, and oxygen than typical stellar material.