...you can add a ton of unnessasary answers on nutrition and your circulatory and digestive system.(i could on a test yesterday but didnt cause in was unnnessasary)
...you can correct what the teacher is teaching and info in books about nutrition and body stuff.
... in forfit, you raise your hand in anatomy class to name the 11th and final bodily system that none of your class mates can think of, "(sigh), Endocrine."