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All trees, regardless of size, break once this wind speed is reached
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The magic number is 42 m/s (94 mph). Using mathematical data and physical experiments, scientists say they have found the law that governs the resistance of wooden beams under stress. According to the study ( link), researchers hung weights from wooden rods and pieces of pencil lead to record the amount of force needed to snap the cylinder. As one might sense, they found that for a fixed length, increasing the diameter made the rods stronger: They could bend more before breaking. This would make tall skinny trees most vulnerable, but, as the team points out, trees don’t grow taller without getting disproportionately thicker as well. By incorporating established laws of tree allometry - which explain the relationship of tree size parameters ...
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12773 |
duddy |
8 years ago |
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Is yawning a sign of empathy?
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At least to some scientists it is. Scientists believe that catching a yawn is a sign of empathy, since it is more likely to occur between relatives than strangers. Plus, other social primates like chimps and bonobos do it, too. A new study suggests that women (traditionally branded the more empathetic sex) might be more susceptible to copycat yawning than men. Researchers surreptitiously analyzed more than 4000 real-world yawns on planes and trains, in restaurants, and in offices. They noted when someone yawned, and then whether a nearby acquaintance or friend did the same within a 3-minute period. Men and women spontaneously yawned with about the same frequency. But when someone else yawned first, women were more likely than men to follow ...
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3266 |
duddy |
7 years ago |
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8 glasses of water a day might be excessive
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A new study that's challenging the popular idea that we should drink eight glasses of water a day for health purposes shows that a 'swallowing inhibition' is activated by the brain after excess liquid is consumed. This inhibition mechanism helps maintain tightly calibrated volumes of water in the body. The lead scientist has pointed out that if we just do what our body demands us to, we'll probably get it right. In other words, it is the best practice to just drink according to thirst rather than an elaborate schedule. Building on a previous study, the researchers asked participants to rate the amount of effort required to swallow water under two conditions; following exercise when they were thirsty and later after they were persuaded to drin ...
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12197 |
duddy |
7 years ago |
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The flipping ship
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The FLIP ( FLoating Instrument Platform) ship is an open ocean research vessel designed to partially flood and pitch backward 90 degrees, resulting in only the front 55 feet (17 metres out of 108 metres) of the vessel pointing up out of the water, with bulkheads becoming decks. When flipped, most of the buoyancy for the platform is provided by water at depths below the influence of surface waves, hence FLIP is a stable platform mostly immune to wave action. At the end of a mission, compressed air is pumped into the ballast tanks in the flooded section and the vessel returns to its horizontal position so it can be towed to a new location. ...
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3752 |
bio_man |
11 years ago |
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Stress-activated gray hair explained
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An unexpected link in mice has been found between gray hair, the transcription factor MITF, and the innate immune in a recent study published in PLOS Biology. First, a discussion on the innate immune system: The innate immune system is the immune system you're born with. This includes your skin and other barriers which prevent disease entering the body, in addition to specialized cells that activate inflammation in response to foreign invaders. Technically, every cell in your body except for red blood cells, are capable of generating an immune response, and this includes the production of a signaling protein known as interferon. Microphthalmia-associated transcription factor (MITF) is best known for its role in regulating the many functions ...
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2400 |
bio_man |
5 years ago |
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A meta-analysis of 40 studies concludes that cinnamon can improve memory and cognitive function
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 A team of researchers at Birjand University of Medical Sciences in Iran recently reviewed several past studies exploring the effects of cinnamon on cognitive functions. Their analysis, outlined in Nutritional Neuroscience, highlights the potential value of cinnamon for preventing or reducing memory or learning impairments. Nakhaee, Kooshki and their colleagues reviewed hundreds of studies stored in several online research databases, including PubMed, Scopus, Google Scholar and Web of Science. They then narrowed down their analysis to 40 of these studies, those that were most pertinent to their topic of interest. Among these 40 studies, 33 were carried out in vivo (i.e., examining real living organisms, such as humans, rodents, or other animal ...
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2636 |
bio_man |
A year ago |
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A sense of control can aid recovery
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If emotions can make you sick, if a belief that you will die can kill you (as in voodoo deaths), and if a sugar pill that you believe is a powerful drug can take away your pain, can a belief that you can bring about your own recovery help you to recover?Even with acceptance of the role of emotional factors in both illness and recovery, the assumption has persisted that emotional factors work on an unconscious level, and because of this they are not subject to voluntary control. Most of us still see illness as something that happens to us. Dr. Carl Simonton, chief of radiation at Travis Air Force Base, questioned this assumption. He was impressed by demonstrations that people could learn to control autonomic processes through biofeedback and ...
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2161 |
bio_man |
A year ago |
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