21.   Historians believe that labyrinths were walked by pilgrims in medieval times.

22.   Historians believe that the animal hides used to make parchment would probably have been taken from any recent kills available when a scholar needed something to write on.

23.   In retrospect, most historians today believe that one invasion would have been enough.

24.   It is a financially struggling apple farm, but on it is a barn with a subterranean room that historians believe harbored escaping slaves.

25.   It is so large that some historians once believed it was the mother church of Lincoln Cathedral.

26.   It reveals, for example, that the first U.S. nuclear weapons placed overseas were sent not to Britain, as many historians had believed, but to Morocco.

27.   Many historians believe that John Paul played a key role in toppling communism through the moral and material support he provided the anti-communist movement in his native Poland.

28.   Many historians today believe Nasser was only posturing.

29.   Most historians believe cockfighting originated in southeast Asia and moved westward to China, India, Europe and eventually to the Caribbean and colonial America.

30.   Most historians believe that centuries of Christian hostility to Jews laid an emotional foundation for modern forms of anti-Semitism, such as Nazism.