NOT IMPORTANT DIARY

This article from SPMB Questions. I try to translate it. About two-thirds of the world's population is expected to live in cities by the year 2020 and, according to the United Nations, approximately 33.7 billion people will inhabit urban areas some ten years later. As cities grow, so does the number of buildings that characterize them: office towers, factories, shopping malls, and high-rise apartment buildings. These structures depend on artificial ventilation systems to keep clean and cool air flowing to the people inside. We know these systems by the term 'air-conditioning'. Although many of us may feel air-conditioners bring relief from hot, or polluted outside air, they pose many potential health hazards. Much research has looked at how the circulation of air inside a closed environment - such as an office building - can spread disease or expose occupants to harmful chemicals. One of the more widely publicized dangers is that of Legionnaire's disease, which was firs...

This is question in SPMB regional III. I try to translate that into Indonesian. It will be useful for me. I may improve my English. You can put your opinion of my translate in bottom of this post as a comment. One of the most mysterious things in nature is the ability of certain creatures to find their way home, sometimes from great distances. Birds are not the only ones who can do this. Bees, eels, and salmon are able to return to a particular place after doing journeys, too. Most migrations take place between breeding grounds and regions where animals feed. For some animals, such as the lemming, the move is a one-way trip. Scientists call this movement emigration, because these animals never return to their homes. For other animals, such as birds, the migration includes a return trip home. Birds move in periodic migration, or at regular times during their lives, and often to the same place year after year. Many experiments have been made with birds in an attempt to find out what guid...