One African American man is looking through a microscope and there is a poster that says blood cells hanging on the wall .
Chances are about even that a teacher shows his students how to use a microscope in the classroom .
Chances are about even that a teacher shows his students how to use a microscope in the classroom .
It is almost certain that a teacher shows his students how to use a microscope in the classroom .
A teacher shows his students how to use a microscope in the classroom .