Correlation does not always equal causation

Washing your reuseable shopping bags is still a good idea.

Washing your reuseable shopping bags is still a good idea.

Very interesting article today on The Washington Post about how we should be careful before assuming that if things are correlated, they must have the same cause. San Francisco has recently banned the use of plastic bags in stores. But a paper recently published suggested that this ban on plastic bags is actually making people sick. Their reasoning behind this was that people aren’t washing the reuseable bags, which actually does make a bit of sense, but there was no data to prove this. Nevertheless, plenty of people panicked. There is some really interesting stuff in this article to show how that might not necessarily be the case:

http://m.washingtonpost.com/blogs/wonkblog/wp/2013/02/16/is-san-franciscos-ban-on-plastic-bags-making-people-sick-perhaps-not/

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