Without doubt the most literate, comprehensive and enjoyable reference work we own. No, it doesn't have anything about nanotechnology; on the other hand, should one desire insight into the strained relationship between Wm Penn (founder of PA) and his long suffering father, one need go no further! The is the British edition, NOT the shamefully revised "American" version which was expressly repudiated by the publishers. (see JRR Tolkien and the ACE ed. of LoTR). ( )