Finally an excuse for my bad black/whiteboardpersonship!

Apparently, retention of information is improved if the way it is presented is difficult to read:

… if something is hard to see or hear, it feels disfluent … We’d found that disfluency led people to think harder about things.

Aside: the lead author, Connor Diemand-Yauman, either has a surprisingly non-unique name, or partakes of reality tv-show contestantship while majoring in psychology.