What are some important questions by historians still left unanswered about the Middle Ages?

Since the Western Historians trying to skip off, by coiling a word  called ,Middle Ages ,instead of using the real events of what happen in Europe, as being fully immerse in the Dark Ages of Anarchy and Atrocities , especially in the Crusaders times ,instigate  by the Catholic Popes that lasted for around 300 years.That is why.

The Black Death actually didn't spread in a "peculiar" way at all -- we pretty much understand the nature of the spread -- but it would be quite interesting to know exactly where and how it started.  Theories vary.  A recent one places the inception of the plague in the 13th century, much earlier than we'd thought, and even suggests that it jumped from marmots to Mongols.

We're actually quite focused now, far more than we used to be, on trying to determine the way ordinary people lived, vs. the "Great Man" theory of history, which focused on kings and nobles and other prominent people.  Absent many documents, we have to study "rubbish" and material culture a great deal -- everything from kitchen middens, old textiles and tools, what diseases people had, where we have bones to study.  "How the other half lived" is what many of us want to know.