When it comes to the greatest scientific discovery in history, I automatically think of Charles Darwin. After learning lots of great facts and interesting things that he did, I think he is the most achieved scientist. 
               If you didn't know, Charles Darwin discovered lots of exotic and unfamiliar animals that were formed by his theory of evolution; when he was studying finches which are small birds, he discovered that although those birds were from the same species, their had a difference in there characteristics. 



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