posted by jenny .
do you think a bias makes a source useless?
I don't think bias makes a source useless. We need to know how other people think -- and a biased source provides this information.
In order to come to rational and objective conclusions, we need to read and hear facts plus many different points of view. Often, a biased source points out facts that we may have missed. By using our knowledge and judgement, we can decide whether we agree or disagree with any subjective source.
I think it really depends on what you are using the source for. If you are writing a paper for a scientific journal for example you would want sources based strictly on facts and not on opinions.
However, if you are writing a persuasive paper you would seek out sources that support your view in order to make your argument stronger.
I hope that helps : )