http://www.speed-light.info/ is a mind boggling website. It deals with scientific revelations in the holy Qur'an. It shows how the holy Qur'an provides scientific facts which were unknown at that time and many of them are still to be proved by modern science. In some sites ( e.g. wikipedia), I found an argument that knowledge similar to some revelations were prevalent in seventh century Arab world. It may be true for only a very few cases but certainly can not be true for the examples given in this site. Though I have read a book (a series of two parts; does not have any electronic version) which had many more such interesting things, I liked this site for being very concise and to the point.