[A Navy Vet]

Sorry Professor, we can't do that without erasing the entire board. BTW, mate, why are still writing on chalk boards"

Answer: We stopped using legal size paper because of the ink smearing.

Professor says, "Have you not heard of white boards with easy wipe off markers?"

Answer: How does a white board work when space is dark?'

Professor says, "Do the math. I'm going to lunch"

[GingisK]

Have you not heard of white boards with easy wipe off markers?"

Funny.

In my own experience, I prefer a chalk board made of slate. It erases very cleanly and chalk is really cheap. Dry erase markers are not cheap, get used up like ammo in a mini-gun, and stink.