Sure, and we still research Gravity today. That doesn't mean we're guessing a ball will drop when released the same as it always has, now does it? At some point you do know what you're talking about, to a degree of certainty beyond "winging it", at any rate.
I find it funny someone downvoted my comment above. They must imagine we really don't know anything about anything. Perhaps we should just throw out all scientific experimentation, proofs, textbooks, etc. ever done and pretend the universe is actually working according to Dr. Seuss type principles. It's just as likely, right? </sarcasm>