Health

Air pollution killed 500k newborns in 2019: global study

Air pollution killed 476,000 newborns in 2019, with the biggest hotspots in India and Sub-Saharan Africa, according to a new global study which said that nearly two-thirds of the deaths came from noxious fumes from cooking ...

Health

Poor diet is top contributor to heart disease deaths globally

More than two-thirds of deaths from heart disease worldwide could be prevented with healthier diets. That's the finding of a study published today in the European Heart Journal—Quality of Care and Clinical Outcomes, from ...

Diseases, Conditions, Syndromes

CDC changes, then retracts, web posting on how virus spreads

The top U.S. public health agency stirred confusion by posting—and then taking down—an apparent change in its position on how easily the coronavirus can spread from person to person through the air.

Diseases, Conditions, Syndromes

Asymptomatic COVID-19 patients also contaminate the environment

Both symptomatic and asymptomatic COVID-19 patients have the capability of contaminating their surroundings, according to a new study published in mSphere, an open-access journal of the American Society for Microbiology. ...

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Atmospheric pressure

Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air one square inch in cross-section, measured from sea level to the top of the atmosphere, would weigh approximately 65.5 newtons (14.7 lbf). The weight of a 1 m2 (11 sq ft) column of air would be about 101 kN (10.3 tf).

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