Diseases, Conditions, Syndromes

COVID-19 mask study finds layering, material choice matter

Wearing a face mask can protect yourself and others from COVID-19, but the type of material and how many fabric layers used can significantly affect exposure risk, finds a study from the Georgia Institute of Technology.

Diseases, Conditions, Syndromes

Strokes on a plane? On-board facial paralysis wasn't what it seemed

Alan J. Hunter from Oregon Health & Science University was a passenger on a recent airline flight when he responded to a flight attendant's request for a "doctor on board." The flight attendant suspected that a young male ...

Cardiology

Higher risk of heart failure in cold weather, study suggests

An increase in hospitalization and death in elderly patients with heart failure could be associated with changes in temperature and atmospheric pressure, according to a new study in Environment International. The authors ...

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Atmosphere

An atmosphere (from Greek ατμός - atmos, 'vapor' + σφαίρα - sphaira, 'sphere') is a layer of gases that may surround a material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low. Some planets consist mainly of various gases, but only their outer layer is their atmosphere (see gas giants).

The term stellar atmosphere describes the outer region of a star, and typically includes the portion starting from the opaque photosphere outwards. Relatively low-temperature stars may form compound molecules in their outer atmosphere. Earth's atmosphere, which contains oxygen used by most organisms for respiration and carbon dioxide used by plants, algae and cyanobacteria for photosynthesis, also protects living organisms from genetic damage by solar ultraviolet radiation. Its current composition is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms.

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