Glenn Bruda came up with the idea for his calculus integration formula late one night in May 2021. He recalled going to bed at 11 p.m. after doing some math for fun. Bruda woke up at 2 a.m. feeling ...

You know that sinking feeling. You've worked through the practice problems, reviewed your notes, and felt confident while studying. But the moment the exam paper hits your desk, the formula you swore ...