Since the Centers for Disease Control and Prevention has recommended cloth face coverings for the general public, many have relied on those while reserving medical masks, such as N95 respirators, for medical workers.
May 21, 2020
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A common, cat-borne parasite already associated with risk-taking behavior and mental illness in humans may also contribute to exhaustion, loss of muscle mass, and other signs of "frailty" in older adults, suggests a study ...
Nov 7, 2023
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Scientists know that coronaviruses, including the SARS-CoV-19 virus responsible for the COVID-19 pandemic, can remain infectious for days—or even longer—in sewage and drinking water.
Apr 3, 2020
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Researchers at the University of Copenhagen have found several hundred different chemical substances in tap water stored in reusable plastic bottles. Several of these substances are potentially harmful to human health. There ...
Feb 11, 2022
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The coronavirus was present in two large Italian cities in December, more than two months before the first case was detected, a national health institute study of waste water has found.
Jun 19, 2020
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After two more cases of flesh-eating bacteria infections were reported from Florida waters recently, Tampa Bay area physicians are warning residents and visitors to be careful swimming in brackish water or eating uncooked ...
Jul 5, 2019
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How should I clean and store my face mask?
May 21, 2020
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When dehydration strikes, part of the brain can swell, neural signaling can intensify, and doing monotonous tasks can get harder.
Aug 21, 2018
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A new University of Chicago study examining Medicare claims found older adults living near fracking sites in Pennsylvania were more likely to be hospitalized for cardiovascular diseases than those who lived in nearby New ...
Mar 7, 2023
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Scientists say that even with the best and most expensive research available, a vaccine against SARS-CoV-2, the virus that causes COVID-19, is at least a year away. Scientists also say that the worst enemy of the virus is ...
Mar 23, 2020
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Water is a ubiquitous chemical substance, composed of hydrogen and oxygen, that is essential for the survival of many known forms of life. In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam. Water covers 71% of the Earth's surface. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Saltwater oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products. Other water is trapped in ice caps, glaciers, aquifers, or in lakes, sometimes providing fresh water for life on land.
Water moves continually through a cycle of evaporation or transpiration (evapotranspiration), precipitation, and runoff, usually reaching the sea. Winds carry water vapor over land at the same rate as runoff into the sea. Over land, evaporation and transpiration contribute to the precipitation over land.
Clean, fresh drinking water is essential to human and other lifeforms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world. There is a clear correlation between access to safe water and GDP per capita. However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability. Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70 percent of freshwater is consumed by agriculture.
This text uses material from Wikipedia, licensed under CC BY-SA
