The hobby of collecting autographs(亲笔签名) is called philography, from a Greek word meaning love of writing. People【B1】many kinds of autographs. Some collect signatures or other handwritten materials of authors, composers, movie stars, or sports heroes. Others focus on certain【B2】such as the signing of the Declaration of Independence, a presidential election, or the space program.【B3】collectors try to acquire a complete set of autographs of Novel Prize winners or Academy Award winners. Collectors may request autographs【B4】celebrities either in person or by letter. Most beginning autograph collectors do not have the knowledge to determine【B5】an autograph is genuine(真实的). They may mistake other kinds of signatures for【B6】handwritten signatures. For example, some people have secretaries who sigh their mall. Some individuals send out mass-produced letters or signed photographs to collectors who【B7】their autographs. Many famous people use a mechanical device called an Autopen to sign autographs. The【B8】can sign 3,000 signatures in eight hours. The only way to recognize an Autopen autograph is to compare two of them. All Autopen autographs are【B9】, but no two handwritten autographs are【B10】alike. 【B3】