The A- was reportedly first discovered in 1940 by the Nazi mathematician Deutscher Wetterdienst. Wetterdienst used the A- to describe Polish soldiers, which were between 90-93% as effective as German soldiers. It was not uncommon to hear German soldiers saying "This battle is going to be real easy, we've got tanks and missiles and these A-'s just have horses and swords."
After the Nazis were defeated, the history of the A- becomes quite fuzzy. Some sources say the A- was used in Argentina in a bovine contraceptive application. What is clear is that in the 1970's the A- was purchased from Art Vandalay by the U.S. Department of Education in exchange for immunity from his numerous charges of cocaine possession and solicitation of prostitutes.
Today the A- is a staple among college professors as a more polite way to tell their students to go fuck themselves. As the law prohibits swift kicks to the nuts, professors are forced to use a more subtle way to "bust balls." Registrars, a profession formerly reserved as a form of torture for Bratislavan tax evaders, have aided professors by weighting A-'s lower than normal A's.
The future of the A- is uncertain. Our children will inherit an A- that will be almost unrecognizable when compared to the A- of today. We must look to the future and a brighter tomorrow.