Structure[ edit ] Cross-section of bone Bone is not uniformly solid, but includes a tough matrix. Its matrix is mostly made up of a composite material incorporating the inorganic mineral calcium phosphate in the chemical arrangement termed calcium hydroxylapatite this is the bone mineral that gives bones their rigidity and collagen , an elastic protein which improves fracture resistance. When these cells become entrapped from osteoblasts they become osteocytes. It forms the hard exterior cortex of bones. It consists of multiple microscopic columns, each called an osteon. Each column is multiple layers of osteoblasts and osteocytes around a central canal called the haversian canal. Volkmann’s canals at right angles connect the osteons together. The columns are metabolically active, and as bone is reabsorbed and created the nature and location of the cells within the osteon will change.
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Big Mouth Billy Bass is an animatronic singing prop, representing a largemouth bass, invented on December 16, , sold from January 1, , and popular in the early s. The fish is made of latex rubber with a plastic mechanical skeleton inside of it; at first glance, it appears to be a mounted game product was conceived by Gemmy Industries product development vice president Joe.
From Nature magazine The carbon clock is getting reset. Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct. Carbon dating is used to work out the age of organic material — in effect, any living thing.
The technique hinges on carbon , a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate. Organisms capture a certain amount of carbon from the atmosphere when they are alive. By measuring the ratio of the radio isotope to non-radioactive carbon, the amount of carbon decay can be worked out, thereby giving an age for the specimen in question.
But that assumes that the amount of carbon in the atmosphere was constant — any variation would speed up or slow down the clock. The clock was initially calibrated by dating objects of known age such as Egyptian mummies and bread from Pompeii; work that won Willard Libby the Nobel Prize in Chemistry. Various geologic, atmospheric and solar processes can influence atmospheric carbon levels. Since the s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.
As a rule, carbon dates are younger than calendar dates: The problem, says Bronk Ramsey, is that tree rings provide a direct record that only goes as far back as about 14, years. Marine records, such as corals, have been used to push farther back in time, but these are less robust because levels of carbon in the atmosphere and the ocean are not identical and tend shift with changes in ocean circulation.
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A fishing rod is a long, flexible rod used to catch fish. At its simplest, a fishing rod is a simple stick or pole attached to a line ending in a hook (formerly known as an angle, hence the term angling).The length of the rod can vary between 2 and 20 feet ( and m).
Their eyebrows shoot up when we order our food sans bread, pasta, rice, polenta or beans. The questions are always the same: You may have heard of it as the Caveman Diet. Usually, when we tell people we eat according to a Paleolithic or ancestral template, they want to hear more. But the last thing I want to do is to yak about nutritional science and evolutionary history over a meal.
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With that said, there are a few things to consider when purchasing your next Spey rod. To begin with, how big are the fish you intent to chase? A seven weight will easily handle steelhead in the 8 to 14 pound range. Matched with the proper line, a seven can handle anything from floating lines to sink-tips. On many Canadian summer rivers and most winter rivers in the Northwest, hooking a 15 to 20 pound fish is an everyday reality.
Furthermore, if your faced with fishing conditions that require throwing heavy sink-tips and big flies, an eight or nine makes it easier. On the other hand, if you plan on fishing one salt summer steelhead where the average fish is 5 to 7 pounds, a six weight would be more applicable. These rods are great for fishing floating lines and surface presentations.
Most folks will start with a seven weight, then build their arsenal of weapons to fit their specific fishing needs.
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An EU-funded trial has found that a £ drink can help to stop the brains of Alzheimer’s patients from shrinking. The two year clinical trial found that ‘Souvenaid’ actually does “manage.
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WHAT IS COLUMNARIS? Columnaris (often referred to as “Cotton Wool Disease”, “Saddleback Disease”, or “Cotton Mouth Disease” and incorrectly referred to as “Guppy Disease”) is a warm water, gram negative strictly aerobic and nonhalophilic (meaning they do not live in saltwater conditions) bacterium often appears like a fungus (or more correctly; Saprolegnia).
Hunting, fishing, cooking, and other critical aspects of life. Hits and Misses Monday, July 29, Dating a Double-Barreled Hammer Gun I recently acquired a hammer shotgun of uncertain age in bad repair because I thought I could learn more about antique shotguns by hands-on examination of a real one. It had several features which I had never seen before, and those in turn led me to ask: How does one begin to date an old shotgun?
After some research, the answer is: First, look at its proof marks, which can reveal country of origin and possibly a range of years; second, observe its features to establish a range of possible dates for its manufacture. The scroll engraving is moderate but well executed, suggesting the gun may not have been top-quality but it was some distance above a utility grade.
A disgrace: Ten million salmon thrown away by fish farm industry in last year alone
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Fly fishing[ edit ] Trading card of the Ustonson company, an early firm specializing in fishing rods, and holder of a Royal Warrant from the s The art of fly fishing took a great leap forward after the English Civil War , where a newly found interest in the activity left its mark on the many books and treatises that were written on the subject at the time.
The renowned officer in the Parliamentary army , Robert Venables , published in The Experienced Angler, or Angling improved, being a general discourse of angling, imparting many of the aptest ways and choicest experiments for the taking of most sorts of fish in pond or river. It was a celebration of the art and spirit of fishing in prose and verse; six verses were quoted from John Dennys ‘s earlier work.
A second part to the book was added by Walton’s friend Charles Cotton. Running rings began to appear along the fishing rods, which gave anglers greater control over the cast line. The rods themselves were also becoming increasingly sophisticated and specialized for different roles. Jointed rods became common from the middle of the century and bamboo came to be used for the top section of the rod, giving it a much greater strength and flexibility.
The industry also became commercialized — rods and tackle were sold at the haberdashers store. After the Great Fire of London in , artisans moved to Redditch which became a centre of production of fishing related products from the s. Onesimus Ustonson established his trading shop in , and his establishment remained as a market leader for the next century.