Why Is My Whiteboard So Dirty?
If you have an old, well-used whiteboard in your classroom, you might see something a little strange -- ghosts! But not the spooky, bust-able kind... these are the ghosts of lectures past!
If you have an old, well-used whiteboard in your classroom, you might see something a little strange -- ghosts! But not the spooky, bust-able kind... these are the ghosts of lectures past!
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