Sid, as an example for what I said (that it couldn't be written by human being), you can take the growth of the fetus in the womb, which is described in Quran a long time ago, before it was studied by science. I also want to separate difference between Messengers and Prophets. Messengers, gave us new Holly books and religions, example Jesus, Muhammad (s.a.a.w), but Prophets are just blessed by God people, example Salаmon. There were a lot of Prophets sent to us, but only few Messengers.