'Almost like malpractice': To shed bias, doctors get schooled to look beyond obesity
When Melissa Boughton complained to her OB-GYN about dull pelvic pain, the doctor responded by asking about her diet and exercise habits.
22 hours ago
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When Melissa Boughton complained to her OB-GYN about dull pelvic pain, the doctor responded by asking about her diet and exercise habits.
22 hours ago
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8
Firearms have surpassed motor vehicle crashes as the leading cause of death among American youngsters, with official data showing a strong rise in gun-related homicides such as the killing of 19 children in a Texas school ...
May 26, 2022
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After a gunman killed at least 19 students and two teachers Tuesday at an elementary school in Uvalde, Texas, this week, horrified parents may be wondering how to talk with their children about it.
May 26, 2022
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Scientists have demonstrated that normal brain aging is accelerated by approximately 26% in people with progressive type 2 diabetes compared to individuals without the disease, reports a study published today in eLife.
May 24, 2022
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Obesity among New Zealand four-year-old children is continuing to decline, but one in three children are still considered overweight, a new University of Otago study shows.
May 24, 2022
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Bone tissue homeostasis is maintained by a balance between bone formation by osteoblasts and bone resorption by osteoclasts. However, when osteoblast function declines with age, bone remodeling becomes out of balance, bone ...
May 23, 2022
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Eating low glycemic index foods promotes a healthier body shape in patients with coronary artery disease, according to a study presented at ACNAP-EuroHeartCare Congress 2022, a scientific congress of the European Society ...
May 23, 2022
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Two cases of monkeypox have been detected in Australia, following reported cases in several European countries. Both are in men just returned from Europe.
May 20, 2022
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FRIDAY, May 20, 2022 (American Heart Association News)—Just a few days after Dottie Lewis and her husband, Wayne, returned from vacation to their home in Plymouth, Massachusetts, she started feeling poorly.
May 20, 2022
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A group of Skoltech scientists led by Professor Evgeny Nikolaev in collaboration with colleagues from MIPT, Engelhardt Institute of Molecular Biology of RAS, and Emanuel Institute of Biochemical Physics of RAS has overviewed ...
May 19, 2022
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Mass can be defined as a quantitive measure of the resistance an object has to change in its velocity. In physics, mass (from Ancient Greek: μᾶζα) commonly refers to any of the following three properties of matter, which have been shown experimentally to be equivalent:
Mass must be distinguished from matter in physics, because matter is a poorly-defined concept, and although all types of agreed-upon matter exhibit mass, it is also the case that many types of energy which are not matter—such as potential energy, kinetic energy, and trapped electromagnetic radiation (photons)—also exhibit mass. Thus, all matter has the property of mass, but not all mass is associated with identifiable matter.
In everyday usage, "mass" is often used interchangeably with weight, and the units of weight are often taken to be kilograms (for instance, a person may state that their weight is 75kg). In scientific use, however, the two terms refer to different, yet related, properties of matter. Weight can be zero if no gravitational force is acting but mass can never be zero.
The inertial mass of an object determines its acceleration in the presence of an applied force. According to Newton's second law of motion, if a body of fixed mass M is subjected to a force F, its acceleration α is given by F/M.
A body's mass also determines the degree to which it generates or is affected by a gravitational field. If a first body of mass MA is placed at a distance r from a second body of mass MB, each body experiences an attractive force F whose magnitude is
where G is the universal constant of gravitation, equal to 6.67×10−11 N m2kg-2. This is sometimes referred to as gravitational mass (when a distinction is necessary, M is used to denote the active gravitational mass and m the passive gravitational mass). Repeated experiments since the 17th century have demonstrated that inertial and gravitational mass are equivalent; this is entailed in the equivalence principle of general relativity.
Special relativity shows that rest mass (or invariant mass) and rest energy are essentially equivalent, via the well-known relationship (E=mc2). This same equation also connects relativistic mass and "relativistic energy" (total system energy). These are concepts that are related to their "rest" counterparts, but they do not have the same value, in systems where there is a net momentum. In order to deduce any of these four quantities from any of the others, in any system which has a net momentum, an equation that takes momentum into account is needed.
Mass (so long as the type and definition of mass is agreed upon) is a conserved quantity over time. From the viewpoint of any single unaccelerated observer, mass can neither be created or destroyed, and special relativity does not change this understanding (though different observers may not agree on how much mass is present, all agree that the amount does not change over time). However, relativity adds the fact that all types of energy have an associated mass, and this mass is added to systems when energy is added, and the associated mass is subtracted from systems when the energy leaves. In such cases, the energy leaving or entering the system carries the added or missing mass with it, since this energy itself has mass. Thus, mass remains conserved when the location of all mass is taken into account.
On the surface of the Earth, the weight W of an object is related to its mass m by
where g is the Earth's gravitational field strength, equal to about 9.81 m s−2. An object's weight depends on its environment, while its mass does not: an object with a mass of 50 kilograms weighs 491 newtons on the surface of the Earth; on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons.
This text uses material from Wikipedia, licensed under CC BY-SA