Man looks through light microscope at a glass slide .
Chances are about even that the scientist sees the Ebola virus in his sample , on the microscope .
It is impossible that the scientist sees the Ebola virus in his sample , on the microscope .
Chances are about even that the scientist sees the Ebola virus in his sample , on the microscope .
The scientist sees the Ebola virus in his sample , on the microscope .