I really liked the third bullet: Historical problems can help develop students’ mathematical thinking. Seems really useful to know the problems humanity was s

I really liked the third bullet: Historical problems can help develop students’ mathematical thinking. Seems really useful to know the problems humanity was struggling with at the time a tool or its notation was developed. Trigonometric functions were nonsense to me until I learned more about astronomy. Once I saw all the problems you could solve with them, everything clicked into place.