Though the largest Sperm whales weigh up to 50 tons and and the smallest bat barely reaches a gram, they share something in common.
They both use echolocation, biological sonar, for hunting.
Echolocation systems are one of nature's most successful specializations. About 1,100 species of bats and roughly 80 species of toothed whales use the technique – that's 25% of all mammals. But why did such different animals as whales and bats evolve the same technique? It isn't biological kinship, bats and whales are no closer related to each other than all the other mammals that descended from the land vertebrates around 200 million years ago.
Thermal infrared (IR) energy is emitted from all things which have a temperature greater than absolute zero - so, basically all things worth looking at.
Though mechanical detection of IR radiation has been possible since Samuel Pierpont Langley invented the bolometer in 1880, human eyes are primarily sensitive to shorter wavelength visible light and are unable to detect or differentiate between the longer-wavelength thermal IR "signatures" given off both by living beings and inanimate objects.
29% of large clinical trials remain unpublished five years after completion and, of those, 78% have no results publicly available, according to a paper published yesterday.
This means that an estimated 250,000 people have been exposed to the risks of trial participation without the societal benefits that accompany the dissemination of their results, worry the authors. Of course, the participants all volunteered for the trials and had informed consent and many were even paid so claiming they were 'exposed to the risks' is emotional verbage designed to guide the public into one conclusion: all trial results should be published.
Women can tell when someone's eyes aren't on her face and are instead looking at her body - because it happens all of the time. Men do it ... and so do other women. At least when they are in college.
The oft-rumored "objectifying gaze" is not just anecdotal evidence, say psychologists who set out to document the nature of roving eyes when it came to women's bodies. A new study employed eyetracking technology to map the visual behavior of college aged men and women as they viewed images of different females with different body types.
Humpback dolphin swimming in the waters off northern Australia are a new species previously unknown to science, according to a team of researchers
To determine the number of distinct species in the family of humpback dolphins (animals named for a peculiar hump just below the dorsal fin), the research team examined the evolutionary history of this family of marine mammals using both physical features and genetic data. While the Atlantic humpback dolphin is a recognized species, this work provides the best evidence to date to split the Indo-Pacific humpback dolphin into three species, one of which is completely new to science.
In 1855, a specimen of the brain of mathematician Carl Friedrich Gauss was taken and preserved. But the over 150-year-old slice of his brain, which scientists had long been examining in the belief that it was Gauss's brain, turns out to not be his brain at all.
Instead, the preserved specimens of the brains of Gauss and Göttingen physician Conrad Heinrich Fuchs, a medical scholar and founder of the University of Göttingen's anatomical pathology collection, were switched, probably soon after the death of both men in 1855, says Renate Schweizer, a neuroscientist at Biomedizinische NMR Forschungs GmbH at the Max Planck Institute for Biophysical Chemistry.
After oxygen in the atmosphere and ocean rose about 600 million years ago, earth got the first proliferation of animal life. Between then and now, numerous short lived biotic events took place when oxygen concentrations in the ocean dipped episodically.
Engaging in some Do It Yourself projects or gardening can cut the risk of a heart attack/stroke and prolong life by as much as 30 per cent among the 60+ age group, indicates a new paper.
They might seem like routine activities but they are as good as exercise, and more fun, which is ideal for older people who don't often do that much formal exercise, according to the scholars who based their findings on almost 4,000 sixty-year-olds in Stockholm, Sweden, who had their cardiovascular health tracked for around 12 years. At the start of the study, participants took part in a health check, which included information on lifestyle, such as diet, smoking, and alcohol intake, and how physically active they were.
Protecting carbon-storing forests in the developing world may be easier than mobilizing government bureaucracies; a recent paper finds that local communities, using simple tools like ropes and sticks, can produce forest carbon data on par with results by government employees using high-tech devices.
Centuries of economic hypotheses have been based on the premise of rational actors: when given a choice between two items, people select the one they value more. But as with many simple premises, this one has a flaw in that it is demonstrably untrue.
A new paper seeks to address whether this bias is truly universal and speculates that it may have been present in humanity's evolutionary past.
A group including a consultant, a sustainability advocate and an environmental scientist argued today at the Geological Society of America meeting in Denver that while the use of hydraulic fracturing and horizontal drilling for "tight oil" is an important contributor to U.S. energy supply, it is not going to result in long-term sustainable production or allow the U.S. to become a net oil exporter.
Having children early and in rapid succession lead to high infant mortality rates in the South Asian countries of Bangladesh, India, Nepal and Pakistan, according to a paper in
the International Journal of Gynecology&Obstetrics.
1 in 14 births to young mothers in those countries ends with the death of the child within the first year, say researchers at the University of California San Diego School of Medicine.
Experiments on individual photons conducted by physicists from the Faculty of Physics at the University of Warsaw (FUW) and the Faculty of Applied Physics and Mathematics at the Gdansk University of Technology (PG), have revealed yet another bizarre feature of the quantum world.
When a quantum object is transmitted, its quantum property, whether it behaves as a wave or as a particle, appears to depend on other properties that at first glance have nothing to do with the transmission, they argue.
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You might think that health care professionals would become jaded to the plights of people over time - especially in an intensive care ward for burn patients.
Not so, according to a paper which catalogs the emotional and psychological anguish, known as "moral distress," experienced by nurses in an intensive care unit for burn patients.
A burn ICU can be an intense work environment. Many patients suffer significant pain and disfigurement. They may be in the ICU for weeks, and require numerous procedures and surgeries.
Think gender is determined by patriarchal biological concepts like a chromosome? You'll never make it in sociology thinking that way.
Instead, the social sciences are slowly overturning concepts like genital and chromosomes and other science, and it is being replaced by self-identity. The criteria for determining gender now, say Laurel Westbrook, assistant professor of sociology at Grand Valley State, and Kristen Schilt, assistant professor of sociology at the University of Chicago, have changed and self-identity is paramount. Only sex-segregated spaces believe that biology determines gender, they conclude.