| http://www.w3.org/ns/prov#value | - What they find is that apart from helium, which is an inert gas that does not take part in chemical reactions, the four most common elements in the Universe are hydrogen, carbon, oxygen and nitrogen, collectively known by the acronym CHON. This is an ultimate truth revealed by a process of enquiry that began when Galileo first turned his telescope towards the sky, and ended with those observations
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