When summer starts with a stifling heat wave, as many places are seeing in 2024, it can pose risks for just about anyone who spends time outside, whether they're runners, people who walk or cycle to work, outdoor workers ...
Jun 23, 2024
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During hot weather—like the wave of 90-plus-degree days that Philly will experience this week—most of the public's attention is focused on skyrocketing outdoor temperatures that can cause serious medical complications ...
Jun 19, 2024
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With summer temperatures soaring, pregnant women need to be extra cautious to avoid heat-related health issues. The body's natural cooling mechanisms are already working overtime during pregnancy, making it more difficult ...
Jun 19, 2024
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A record-breaking heat wave is spreading across the United States, baking the Northeast and Midwest with high temperatures and sweltering humidity.
Jun 19, 2024
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Modern therapies have extended the lives of many cancer patients; however, survivors often live with chronic health conditions, including cardiovascular disease. New research published in the Journal of the American College ...
Jun 18, 2024
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With wildfires becoming more frequent and extensive in Canada, it's important for people to understand the health risks of wildfire smoke. An article in CMAJ (Canadian Medical Association Journal) aims to provide information ...
Jun 17, 2024
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To shield older residents from dangerous air pollution, new care homes should be built as far from heavy traffic as possible, according to a new study from the University of Surrey. The study is published in the journal Atmospheric ...
Jun 12, 2024
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British television host and celebrity doctor Michael Mosley went missing last Wednesday while holidaying on the Greek island of Symi.
Jun 12, 2024
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Digestive Disease Week, the annual meeting sponsored by the American Association for the Study of Liver Diseases, American Gastroenterological Association, American Society for Gastrointestinal Endoscopy, and Society for ...
Jun 4, 2024
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A new series published in the Journal of the American College of Cardiology highlights how pollution, in all its forms, is a greater health threat than that of war, terrorism, malaria, HIV, tuberculosis, drugs and alcohol ...
Jun 3, 2024
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The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. It has a mass of about five quadrillion metric tons. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.
There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during atmospheric reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface.
This text uses material from Wikipedia, licensed under CC BY-SA
