AP Calculus AB, BC and IB Calculus teacher Brian Miller sat under the bright ballroom lights in Crown Center, a stack of AP free response question packets sitting next to him at his table group. Around him, six other Advanced Placement Exam graders — calculus teachers from across the country — marked on rubrics, murmured to themselves about wrong answers and occasionally called over a table leader to settle a question.  At first glance, the tests looked like intelligent demonstrations of calculus skill, but upon closer inspection, he noticed the same small mistake repeated on multiple tests. Students solved the complicated limits correctly but stopped writing “limit as h approaches zero” in each step. On this nine-point problem, this tiny mistake cost students seven points.  “As an AP reader, you’re supposed to stop grading the second you don’t see the limit as ‘h approaches zero’,” Miller said.  To read more, click the link in bio. #storybymeredithwacha #designbyanyahudson #social...