Question mark
In the early 13th century, when the growth of communities of scholars (universities) in Paris and other major cities led to an expansion and streamlining of the book-production trade, punctuation was rationalized by assigning Alcuin's stroke-over-dot specifically to interrogatives; by this time the stroke was more sharply curved and can easily be recognized as the modern question mark.
Q source
While the two-source hypothesis remains the most popular explanation for the synoptic gospels' origins, the existence of the "minor agreements" has raised serious concerns. These minor agreements are those points where Matthew and Luke agree against or beyond Mark precisely within their Markan verses (for example, the mocking question at the beating of Jesus, "Who is it that struck you?" [//], found in both Matthew and Luke but not in Mark, although it should be noted that this "minor agreement" falls outside the usually accepted range of Q.) The "minor agreements" call into question the proposition that Matthew and Luke knew Mark but not each other, e.g. Luke might have indeed been following Matthew, or at least a Matthew-like source. Peabody and McNicol argue that until a reasonable explanation is found the two-source hypothesis is not viable.