What’s the difference between a rotary and a roundabout?

According to Gertrude Stein, “...a rose is a rose is a rose.” But according to the Massachusetts Department of Transportation, a circle is not roundabout is not a rotary.

This week, GBH’s Curiosity Desk embraces the rapid fire format, and takes on series of recent audience questions.

Things kick off with an examination of those differences between a roundabout and a rotary, two staples of eastern Massachusetts roadways. From there, officials at Boston's Encore weigh in on whether it’s true that casinos pump oxygen in to keep customers alert and gambling, we examine whether a big beard mean a big increase in the number of germs hanging around on one's face and look into the distinctions between a Dutch and French kruller.

WATCH: Curiosity Desk mailbag — What’s the difference between a rotary and a roundabout?