I am a little bit unsure if I should start a topic about this on meta, but I wanted to ask here before: We have over the past year or so received quite a lot of obviously factually incorrect answers, which at a first glance seem well-written and perhaps therefore gain a lot of up-votes and/or are accepted by OP despite their contentual errors. Is this acceptable or do we need to do something about the situation? If so, how can we deal with these answers?