Dyscalculia is a math learning disability that impairs an individual's ability to represent and process numerical magnitude in a typical way. Some people call it “math dyslexia.” Common symptoms of dyscalculia include difficulty with number sense, fact and calculation, and mathematical reasoning.
It's not "why might classes be canceled or delayed"
To have a good communication with your supervisor, to listen to their ideas, but also to present them with some of your own, to be polite and patient, to achieve a great rapport and in the end finish the job successfully.
The first answer: The pianist's great talent was he could play the rachmaninoff blindfolded.