Check moles during Skin Cancer Awareness Month
Learning your ABCs can alert you to changes in moles that could signal melanoma—the most serious type of skin cancer.
May 13, 2022
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Learning your ABCs can alert you to changes in moles that could signal melanoma—the most serious type of skin cancer.
May 13, 2022
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In a new study published in Philosophical Transactions of the Royal Society B, scientists from Vienna-based Central European University have found that babies as young as 14 months old can consider several alternatives on ...
Nov 21, 2022
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Turns out that relationships are the secret to keeping calm and carrying on.
Apr 8, 2019
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A variety of psychological and physical conditions can cause variations in the diameter of the pupil—the black center of the eye that changes in size to regulate the amount of light reaching the retina and to sharpen images. ...
Mar 23, 2022
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An abnormally enlarged aorta—also called aortic aneurysm—can tear or rupture and cause sudden cardiac death. Unfortunately, patients often show no signs or symptoms before the aorta, which carries blood from the heart ...
Dec 2, 2021
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Athletics training is associated with an increase in the athletes' heart ventricle wall thickness and cavity size. These changes are facilitated by the growth of heart muscle cells, or myocytes, in response to an increased ...
Mar 29, 2019
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Golfers looking to improve their putting may find an advantage in visualizing the hole as bigger, according to a new study from Purdue University.
Apr 3, 2012
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Synchrony in heart rate, skin conductance and pupil diameter plays a big role in human social interactions, such as gaining trust or being attracted toward each other. This is what Eliska Prochazkova found in several lab ...
Mar 4, 2021
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There is a difference between how the brains of healthy older adults perceive color compared to younger adults, finds a new study led by UCL researchers.
Jan 22, 2024
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(HealthDay)—A pulsed-dye laser with a novel 15-mm diameter treatment beam improves the appearance of rosacea, according to a study published online April 10 in Lasers in Surgery and Medicine.
Apr 20, 2018
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In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle. The word "diameter" derives from Greek διάμετρος (diametros), "diagonal of a circle", from δια- (dia-), "across, through" + μέτρον (metron), "a measure").
In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter, because all diameters of a circle have the same length, this being twice the radius.
For a convex shape in the plane, the diameter is defined to be the largest distance that can be formed between two opposite parallel lines tangent to its boundary, and the width is defined to be the smallest such distance. For a curve of constant width such as the Reuleaux triangle, the width and diameter are the same because all such pairs of parallel tangent lines have the same distance. See also Tangent lines to circles.
This text uses material from Wikipedia, licensed under CC BY-SA