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.
Mark Goodacre
Mark Goodacre (born 1967 in Leicestershire, England) is a New Testament scholar and Professor at Duke University's Department of Religion. He has written extensively on the Synoptic Problem; that is, the origins of the gospels of Matthew, Mark, and Luke. He has defended the Farrer hypothesis, and thus accepts Markan priority but rejects Q.