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A link between depression and heart disease
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For quite some time it's been known in the medical community that a link exists between depression and heart disease. For example, large epidemiological surveys typically find that 1.5 to 3 percent of the population is depressed at any given time. Among patients with heart disease, however, the rate of depression is closer to 18 percent. Similarly, about 1 in 6 people in the general population has an episode of major depression during their lifetimes, compared to about 50 percent of people with heart disease. Finally, a Canadian study revealed that of 222 patients who had suffered heart attacks, those who were depressed were four times as likely to die within the next 6 months. Amassing this evidence is one thing, but explaining it is quite ...
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Biology Forums Blog |
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1051 |
bio_man |
11 months ago |
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How to cut in front of a line (persuasion tactic)
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A Harvard researcher, Ellen Langer (1978), studied the effects of asking someone for a favor while giving them a reason for why it was needed. Langer had an accomplice approach a line of people waiting for a copy machine in a library. The accomplice made the request to jump to the front of the line in one of three ways. One request simply stated that the accomplice had only five pages to copy, so would it be okay if they went to the front of the line. Another request also stated that they had only five pages to copy, but it also included the accomplice saying that they needed to jump to the front of the line because they were in a rush. In response to the first request, only 60 percent of those waiting in line allowed the accomplice to jump ...
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Biology Forums Blog |
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1241 |
bio_man |
11 months ago |
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The Secrets of Longevity: Exploring Okinawa, Japan
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Have you ever wondered where people live the longest and healthiest lives on Earth? Look no further than the enchanting islands of Okinawa, Japan. Nestled in the East China Sea, Okinawa has gained international recognition for its high number of centenarians and remarkable longevity. Currently, there are 457 people in Okinawa aged 100 or over, an average of 35 for each 100,000 inhabitants. While Japanese people generally live longer than any other nation, the Okinawa inhabitants reach ages that take by surprise even the other Japanese: an average of 86 for women and 78 for men. One of the key factors contributing to the longevity of Okinawa's residents is their traditional diet. The Okinawan diet is rich in plant-based foods such as sweet po ...
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Biology Forums Blog |
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1406 |
bio_man |
11 months ago |
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Unusual Plant Defenses
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 Plants have evolved a remarkable array of strategies to defend themselves against herbivores, and one such strategy involves attracting insects that act as natural enemies to these plant-eating pests. The fascinating interplay between plants, insects, and the chemical signals they utilize continues to captivate researchers in the field. In the case of the beet armyworm caterpillar, scientists have discovered that its saliva contains a chemical called volicitin, which plays a crucial role in eliciting a defensive response from the plant. When the caterpillar feeds on corn seedlings, the volicitin triggers the release of chemical signals from the leaves, effectively attracting parasitic wasps. These wasps, in turn, prey on the caterpillars, pr ...
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Biology Forums Blog |
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2064 |
bio_man |
11 months ago |
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3D Imaging: A Practical Use of Mathematics
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 3D imaging used in dentistry. Once a panoramic x-ray is taken, the technician uses software to rotate the image; the software uses matrix mathematics to compute the position of the rotated image.One use for matrix math is in programming 3D engines for video games. A single point on the screen can be defined as a vector. The TV or computer screen is two-dimensional only, so to create the look of depth, objects must change size as they come closer to the viewer or go farther back into the scene. An image is made up of hundreds or thousands of vectors. By multiplying this set or matrix, you can change its size. You can also multiply the vector array by another array, which allows you to rotate the image. In rotation, parts of the image become ...
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Biology Forums Blog |
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2043 |
bio_man |
11 months ago |
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