People throughout Nigeria began using the invention.And it became popular with farmers in other African countries.Mohammed Bah Abba personally financed the first five thousand pot­in­pot systems for his own community and five villages nearby.

　　In two thousand，the Rolex Watch Company of Switzerland honored him with the Rolex Award for Enterprise.This award recognizes people trying to develop projects aimed at improving human knowledge and well­being.

　　A committee considers projects in science and medicine，technology，exploration and discovery，the environment and cultural history.Winners receive financial assistance to help develop and extend their projects.

　　The award is given every two years.The next one will be given in two thousand eight.

　　Title：A New Cooling System

　　Column Content

　　Background It is difficult for the poor to keep food fresh，for both refrigerators and electricity are (1).Besides，spoiled food results in (2) and losses of money.

　　When In 1995

　　(3) In Northern Nigeria

　　Who Mohammed Bah Abba

　　(4) “Pot­in­Pot Preservation/Cooling System.”

　　How A smaller pot filled with fruit，vegetables or drinks is placed in a larger one，with the space between them full of wet sand.All the cooling system is covered with a wet cloth.If the water in the sand is evaporated，it will take in (5) from the inner pot，thus (6) the temperature of the inner pot to drop several degrees，so that the foods can stay fresh for several weeks.

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