they heard shots from places besides
             the book depository, and other things that
             may contradict what is stated above. One of
             these witnesses, Abraham Zapruder, captured
             the entire assassination on his "Bell and
             Howell" video camera. This movie, cleverly
             called the Zapruder Film, is the single best
             piece of visual evidence in this case. In
             order to more clearly understand the Zapruder
             Film, it is necessary to break it down into
             frames. The particular "Bell and Howell"
             movie camera that Zapruder was using ran at
             about twenty frames per second.
             ...