From my perspective, Alucard94 is spot on (not thinking of his most recent post...). Science can show and predict all it want, but we can't really know for sure until it happens (or not). Because in many cases, science is not infallible, that's why there are a lot of experiments going on (LHC for one example). We use incomplete formulas to guesstimate results from experimental machinery. And scientists aren't themselves always to count on since you have scientists claiming something for every possible occasion, claiming the moon is made out of cheese and whatnot. If it's something that _could_ happen, I bet you can find a scientists or two claiming it is 100% sure. Even though you can also find scientists claiming the exact opposite.
It's a perplexing art, and people need to know that if a person has the "scientist" title, doesn't necessarily mean that he or she is always correct.
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