A teacher at the front of a small blackboard opening a book for a class of young children .
It is impossible that a woman is about to start teaching a class of math to young children .
There is a better than even chance that a woman is about to start teaching a class of math to young children .
It is impossible that a woman is about to start teaching a class of math to young children .
A woman is about to start teaching a class of math to young children .