Computers have been helping grade multiple choice tests such as the SATs and ACTs for decades. (No. 2 pencil, please.) But the task of reading through student essays has always gone to humans--until ...

Here's a little pop quiz. Multiple-choice tests are useful because: A: They're cheap to score. B: They can be scored quickly. C: They score without human bias. D: All of the above. It would take a ...