Some of the world’s most valuable books and manuscripts – texts which have altered the very fabric of our understanding – will go on display in Cambridge this week as Cambridge University Library celebrates its 600th birthday with a once-in-a-lifetime exhibition of its greatest treasures. - See more at: http://www.cam.ac.uk/research/news/lines-of-thought-discoveries-that-changed-the-world#sthash.DztowzCc.dpuf