Back in 2002, psychologists studying how couples argued found four different behaviors that correlated strongly with future divorce. In fact, in a small sample of 80 couples, the combination of those behaviors could be used to predict who would divorce over the next 14 years with 93% accuracy. The good news: While these behaviors are all things that people probably do sometimes, it's the frequency of behaviors that matters ... and, better yet, they're all things that you can change. At PsySociety, Melanie Tannenbaum uses the amazingly spot-on example of Kim Kardashian and Kris Humphries to illustrate how unhealthy arguments can lead to relationship collapse.
Let's just play this safe and assume that, until more samples have been collected and detailed DNA analysis has been done, the real answer to the question, "Is bacteria found in Antarctica's Lake Vostok actually new to science or just contamination from the drilling?" is "We don't really know." This is a great example of why making scientific pronouncements from the field, before you've had time to do the really in-depth analysis that goes into writing a peer-reviewed research paper, can be problematic. Right now, you've got different camps of researchers making totally contradictory claims. Who is right is, so far, anybody's guess.