This is the VOA Special English Development Report.
few degrees can make a big difference when it comes to food storage. Foods can
go bad if they get too warm. But for many of the world's poor, finding a good
way to keep food cool is difficult. Refrigerators are costly and they need
spoiled food not only creates health risks but also economic losses. Farmers
lose money when they have to throw away products that they cannot sell quickly.
in nineteen ninety-five a teacher in northern Nigeria named Mohammed Bah Abba
found a solution. He developed the "Pot-in-Pot Preservation/Cooling
System." It uses two round containers made of clay. A smaller pot is
placed inside a larger one.
space between the two pots is filled with wet sand. The inner pot can be filled
with fruit, vegetables or drinks. A wet cloth covers the whole cooling system.
stored in the smaller pot is kept from spoiling through a simple evaporation
process. Water in the sand between the two pots evaporates through the surface
of the larger pot, where drier outside air is moving.
evaporation process creates a drop in temperature of several degrees. This
cools the inner pot and helps keep food safe from harmful bacteria. Some foods
can be kept fresh this way for several weeks.
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 pot-in-pot systems for his own community and five villages
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 well-being.
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 most recent one
was given last year.
that's the VOA Special English Development Report, written by Jill Moss. You
can learn more about the Rolex Awards at rolexawards.com. And you can learn
more about technology and the developing world at voaspecialenglish.com. This is Shep O'Neal .