Answer-sheets in some classrooms found wrong-to-right erasures on test sheets that had standard deviations 20 to 50 times above the state norm.
The company that carried out the analysis flagged all classrooms that showed a number of wrong-to-right erasures exceeding three standard deviations from the mean.
Eyebrows were raised because the chances of such erasures happening randomly is just one in 370.At least 180 teachers were accused of cheating, of which 82 confessed to taking part.
They flagged classrooms with an average number of wrong-to-right erasures more than three standard deviations above the state average.
Dr Bennett built on the work of his IBM colleague Rolf Landauer, who proved that the only steps in a computation that necessarily produce waste heat are erasures of information.
That done, the drive is sent on to a contractor which deals with more significant erasures.
More than half of Atlanta's elementary and middle schools had such classrooms, and many had erasures more than 20 to 50 standard deviations above the norm.
In 1948 he began another autobiography, La Règle du jeu ("The Rules of the Game"), which was published in four volumes as Biffures (1948; "Erasures"), Fourbis (1955; "Odds and Ends"), Fibrilles (1966; "Fibrils"), and Frêle Bruit (1976; "Frail Noise") and which was replete with memories of childhood humiliations, sexual fantasies, and contemplations of death.
"One can almost look over Einstein's shoulder while he was at work, his elegant handwriting, the corrections and equations, the erasures and additions," the exhibit's curator Hanoch Gutfreund said ahead of the opening.
Thus, printing stock that permits multiple erasures is chosen.
Erasures, which could be made on wax with the blunt end of a stylus and on papyrus by wiping with a wet sponge, were more difficult on vellum written with iron-gall inks.
