The lowest-priced item that has been used or worn previously.The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a display model or store return that has been used.See details for description of any imperfections.
How to make it, break it, hack it, crack it.The secret history of codes and code breaking.Simon Singh's best-selling title The Code Book now re-issued for the young-adult market.
Simon Singh is an author, science journalist and TV producer. Having completed his PhD at Cambridge he worked from 1991 to 1997 at the BBC producing Tomorrow's World and co-directing the BAFTA award-winning documentary Fermat's Last Theorem for the Horizon series. In 1997, he published Fermat's Last Theorem, which was a best-seller in Britain and translated into 22 languages.