Busy day at WMBriggs.com-land, so only a slight puzzle.
If you want to be a scientist, it is essential—I speak in earnest—to learn the calculus. Indeed, the importance of this branch of mathematics is impossible to overstate. Without it, you will never have more than an imperfect sketchy fractional crude view of any modern scientific field.
But since calculus takes time to master—it is difficult, vast, and subtle—the years spent learning it can be put to better use doing actual science. Anyway, calculus permeates university and even ordinary life. We’ve all seen calculus equations in newspapers, on Facebook, Twitter, everywhere. You can surely absorb what you need as you go along, just by being part of our modern scientific culture
Consider that the subject is on everbody’s mind, it’s part of the daily discourse, it is “built in”, so to speak, to everything. Why, after five or ten years, by sheer osmosis you’ll have had enough of it knocked into your head that you could write books on the subject. Or, if you were feeling especially ambitious and had a free afternoon, you could always read a popular account penned by some science writer—a book or Wikipedia article which hits the highlights.
Could be a waste of time with Wikipedia, though. You could be out doing science instead. Just get on with it!