Randall Munroe’s XKCD ‘Water Filtration’

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            <img alt="" height="467" src="https://images.squarespace-cdn.com/content/v1/5355d604e4b03c3e9896e131/387450f7-0c5b-4e62-85be-87148f628a01/water_filtration.png?format=1000w" width="593" />

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via the comic & dry wit of Randall Munroe, creator of XKCD

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