She lifted her wrist and the chalk began to scurry across the blackboard.
One line, then another, the girl's writing was wildly elegant and wickedly clever, yet not untidy. With each stroke and flick, there was a natural flair, wildly so.
Less than five minutes had passed.
The girl put down the chalk in her hand, turned her head, and with a calm expression on her face, she looked at him and said quite politely, "Mr. Ullmer, I'm done. Could you check if it's correct?"
Physics teacher: ...
He didn't need to check; he had watched the whole process. What she wrote was indeed the correct answer.
Moreover, it was even simpler than the standard answer he had in hand.
"It's correct." The physics teacher was convinced and turned around to face the students of Class A, saying, "The solution on the board is the correct one. Make sure to copy it down and study this type of problem thoroughly, as it's very likely to come up in this year's college entrance exam."