Regular aerobic exercise such as walking may protect the memory center in the brain. Meanwhile, stretching exercise may cause the center called the hippocampus to shrink, the researchers reported. A…

Regular aerobic exercise such as walking may protect the memory center in the brain. Meanwhile, stretching exercise may cause the center called the hippocampus to shrink, the researchers reported. A…

Text 6  Regular aerobic exercise such as walking may protect the memory center in the brain. Meanwhile, stretching exercise may cause the center called the hippocampus to shrink, the researchers…

Text 5  Pollution is an environmental concern for people throughout the world. One university study suggests that pollutants in the water, air, and soil cause up to 40 percent of…

Text 5  Pollution is an environmental concern for people throughout the world. One university study suggests that pollutants in the water, air, and soil cause up to 40 percent of…

Ecotourism is defined as 'purposeful travel that creates an understanding of cultural and natural history, while safeguarding the integrity of the ecosystem and producing economic benefits that encourage conservation. The…

Population growth occurs because there are currently three births for every death. In the past, the crude birth rates were only slightly higher than crude death rates, but with improvements…

The coal, oil, and natural gas that drive the industrial world's economy all contain carbon inhaled by plants hundreds of millions of years ago-carbon that now is returning to the…