Unaweep Canyon is a puzzling landscape—the only canyon on Earth with two mouths. First formally documented by western explorers mapping the Colorado Territory in the 1800s, Unaweep Canyon has inspired numerous hypotheses ...
Earth Sciences
Mar 19, 2015
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47
Engraved objects are usually seen as a hallmark of cognition and symbolism, which are viewed as important features of modern human behavior. In recent years, engraved ochre, bones and ostrich eggs unearthed from various Paleolithic ...
Archaeology
Dec 24, 2012
0
1
An international team of archaeologists, historians and tattoo artists has found evidence that suggests Ötzi the Iceman's tattoos were made via hand-poking with a single-pointed tool. In their study, published in the European ...
(Phys.org) —Artifacts from the Middle Stone Age, which lasted from about 200,000 to 50,000 years ago, provide us with the earliest glimpses of modern human art and culture. Previously, scientists thought an increase in ...
A new "solder" for laser welding of tissue during surgical operations has the potential to produce stronger seals and expand use of this alternative to conventional sutures and stapling in intestinal surgery, scientists are ...
Nanomaterials
May 8, 2013
0
2
(PhysOrg.com) -- Surgical adhesives, which can be used to seal tissues after an operation or to repair wounds, are becoming increasingly important parts of a doctor's toolkit. However, their one-size-fits-all nature means ...
Materials Science
Jul 10, 2009
2
0
Jack, a 12-year-old Yorkshire terrier, was lethargic and gasping for air when he arrived at the University of Missouri Veterinary Hospital. His tongue and gums were a bluish-purple. But, just one day following an innovative ...
Other
Oct 4, 2011
0
0
An international team of earth scientists has linked the establishment of the Mekong River to a period of major intensification of the Asian monsoon during the middle Miocene, about 17 million years ago, findings that supplant ...
Environment
Oct 16, 2018
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67
A new research paper published in Science Advances reveals how changes in the size of the Yangtze River watershed may have led to the carving of deep canyons.
Earth Sciences
Sep 22, 2023
0
87
Imagine if doctors could perform surgery without ever having to cut through your skin. Or if they could diagnose cancer by seeing tumors inside the body with a procedure that is as simple as an ultrasound. Thanks to a technique ...
Engineering
Jun 26, 2012
1
0
Cutting is the separation of a physical object, or a portion of a physical object, into two portions, through the application of an acutely directed force. An implement commonly used for cutting is the knife or in medical cases the scalpel. However, any sufficiently sharp object is capable of cutting if it has a hardness sufficiently larger than the object being cut, and if it is applied with sufficient force. Cutting also describes the action of a saw which removes material in the process of cutting.
Cutting is a compressive and shearing phenomenon, and occurs only when the total stress generated by the cutting implement exceeds the ultimate strength of the material of the object being cut. The simplest applicable equation is stress = force/area: The stress generated by a cutting implement is directly proportional to the force with which it is applied, and inversely proportional to the area of contact. Hence, the smaller the area (i.e., the sharper the cutting implement), the less force is needed to cut something.
This text uses material from Wikipedia, licensed under CC BY-SA
