So I'm having to develop a new physical science course from scratch this year, with very little help from my two colleagues. Essentially I do all of the planning as the new first year teacher at this school and they try to shoot everything down but eventually end up following my lessons anyway because they never really contribute anything of their own in time for us to be prepared to teach it. One of the latest annoyances is that in order to teach the lesson progression, I am certainly going to have to hit upon things that they cover in chemistry, physics, and astronomy. It's a physical science course meaning that they'll be essentially getting a short survey of chemistry. Well one of the chemistry teachers on the team isn't too happy that we're going to be doing activities similar to what she does in chemistry in our class because she's afraid that the kids will not want to do it a second time or will complain that they've already learned this. I understand this feeling, but it's a physical science course, and they have to learn how to do certain things that they're definitely probably going to see again in more depth later. I'm of the opinion that it never hurts for kids to see things twice, especially since they probably didn't really learn it the first time around. Also there's very little that's brand new in teaching science, and everything is essentially variations on things that have been done for many decades. The teachers (the same teachers who are supposed to be helping me plan the course) are asking me to nix something that essentially a key part to the curriculum, and as you can probably tell from the tone of this post, I'm a little fed up with their constant shutting down but zero positive input. I've been content to just ignore them and do things my way, and they follow along but now they are saying that I need to rein it in and allow them to approve or disapprove of what I should teach in my classroom because they don't want it coinciding with something that they teach later. I used to teach middle school and most of the activities we do in middle school they do in high school again anyway. I feel like if they have such strong opinion on how this course should be designed and taught, then they should design some of the units themselves instead of putting it all on me and just criticizing it afterwards.