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spec: As such , they do not know or care why the Americans came to fight half a century ago . Parental factors ( for example , affection ) reduced the odds of being a regular smoker compared with an experimental smoker or non-smoker , but did not differentiate experimental smokers from non-smokers . The study of complex adaptive matter , part of the general study of complexity , attempts to understand what happens when scientists put enough things together they do n't know or for which they ca n't make predictions . For those uninitiated in northern ways , curling is a winter sport that involves sliding a hubcab-sized ' puck ' down the ice toward a bulls-eye . Some companies market to customers they do n't know or understand . We wanted to highlight just a few of them .