(Latin: toile to toilette in Middle French)

(Latin: toile to toilette in Middle French)

(Latin: toile to toilette in Middle French to "toilet" in English)

(Latin: toile to toilette in Middle French to "toilet" in English)

(unsanitary toilets for the public)

(toilet paper is a very modern product of convenience)

(toilets were finally developed into practical utilities)

(an excess of nutrients flowing from the land to the sea has created serious environment problems)

(an excess of nutrients flowing from the land to the sea has created serious environmental problems)

(an excess of nutrients flowing from the land to the sea has created serious environmental problems)

(an excess of nutrients flowing from the land to the sea has created serious environmental problems)

(using plants; such as, algae to clean up waste water)

(once considered in poor taste; the joke was not nearly as vulgar as those that are currently expressed on many U.S. TV shows)

(unusual water recycling device is revealed)