Don't scientific understandings come wrong? Many drugs, well studied previously, still got banned due to serious adverse effects even to fatal level, on field applications. Does it not make science as doubtful or skeptical? Say for eg. a man started climbing a mountain and could yet climb say 50% and still climbing. Yes he can reach on top on any day. But if he found, path was right having much odds or he crash down, how then you can claim, man took right path without doubts?