There are groups trying to help clean up the science tag like the one I participate in (@steemstem), however it's extremely difficult since we have no control what people vote on. Flagging stuff doesn't fix the issue, so the only solution seems to be to promote and help good content get rewarded. Even still #science is a mess. You should also know that it was much much worse before we and others started. We have a chat on steemit.chat as well #steemSTEM if you are interested in stopping by