In general, people are living longer now. Discuss the causes of this phenomenon. Use specific reasons and details to develop your essay. Human kind's life span has increased much longer nowadays. There are three crucial reasons for this phenomenon: better hygiene, medicine development growing largely, and providing food sufficiently. Along with the evolution of economy, people improve their lifes greatly. Hence, they pay more attention on living qualities. They started to think about personal and public hygiene was critical factor about living qualities and health. People can not live in a dirty, disgusting place without having infected by small organisms. More and more researched have found that disease may be caused by what pathogens and how they transmit. Gorvernments began to advocate the importance of hygiene and preventer of exposion to pathogens. Another reason why hygiene has been improving is that prosperous economy makes people can pay for a better living environment. The GDP of a country is always in proportion to the hygiene of the country. The second reason for people's longer life span is medicine development has progressed extremely. Scientists work diligently on finding causes and therapies of diseases. Drugs cure most of ills, progressed sugery instruments help doctors handle the unexpected. Even gene therapy can cure many disease that were formerly fatal. Vaccines prevent infecting from various pathogens. New devices and methods help enable people to inspect physical conditions correctly and find abnormalities earlier. The advances in agriculture and food industry make us keep away from starving. Human beings' population has been soaring because of plenty food supply. Starvation is a major cause of death in ancient times. Now we no longer suffer from lacking food intake. Better hygiene, progression of medicine, and sufficient of food make humans live longer. However, new problems are coming out with the longer life span. Such as geriatric problems will be next hot potatoes we should face. <thanks for any suggestions.> -- thanks for David's contribution to this board. --

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