I suspect that the conclusion was drawn from some bloody research papers. The problem is that there is too much money floating around to fund these unnecessary 'researches'. The poor researchers have to come up with some interesting conclusions. If u dont, u have to conjure one and make it more interesting. If the research finds nothing new and interesting, how do you justifiy the expenses that probably consumed thousands of dollars and many manhours. Thats why they come up with something like "there is a possibility that........" or "we dont find evidence to negate the notion that theere will not be a mass extinction.....". And there are these reporters......! Of course, there is a possibility that rice could be grown in Mars. There is a possibility that one day Nepal will have good leaders. There is a possibility that one day man will live in Jupiter. There is a possibility that yours truly JagaltayBhoot will be the president of the United States of America one day. Cool down people, this is only a possibility !