Well if the fact is right.. I wouldn't care much.. At least the text is still teaching you real facts(even if they can't notate scientifically) instead of being like my physic's book. We just threw it out mostly... Teach couldn't even get anything out of it.. and she has been teaching physics for 20+ years easy. But this book was just messed up. Many times you could get the answer from thier setup.. but you would repeat several steps(didn't need to) and it mixed words up quite often.. Talk about a messed up year.