Ever since I started subsitute teaching, I've been using riddles as a tool to keep the class interested and attentive. I've decided that I'll occasionally throw a riddle in my blog. For the answer, just go to the comment section in the post below. If you want to try to figure it out, go to the comment section in this post. Good luck!
What occurs once in a minute, twice in a moment, but NEVER in a thousand years?