What is worth more: The signature of Theodor Herzl, the visionary of the State of Israel, or the signature of William McKinley, the 25th president of the United States? A first edition of all the writings of Hebrew poet Haim Nahman Bialik or of "The Adventures of Tom Sawyer" by Mark Twain? You certainly won't be surprised that the American items are worth at least 20 times as much as the Israeli ones....