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Flint hand axe found in Winchester. Wedges have existed for thousands of years. They were first made of simple stone. Perhaps the first example of a wedge is the hand axe (see also Olorgesailie), which is made by chipping stone, generally flint, to form a bifacial edge, or wedge. A wedge is a simple machine that transforms lateral force and ...
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
Between each series of strikes, a pause of several minutes allows the stone to react to the pressure. Eventually a crack appears along the line that was scored on the surface and the stone splits apart. Attempting to split the stone too quickly may cause the stone to "blow out" at the site of the plug or split at an undesirable section.
A sialogogue (also spelled sialagogue, ptysmagogue or ptyalagogue) is a substance, especially a medication, that increases the flow rate of saliva. [1] The definition focuses on substances that promote production or secretion of saliva (proximal causation) rather than any food that is mouthwatering (distal causation that triggers proximal causation).
The Levallois technique (IPA:) is a name given by archaeologists to a distinctive type of stone knapping developed around 250,000 to 400,000 [1] years ago during the Middle Palaeolithic period. It is part of the Mousterian stone tool industry, and was used by the Neanderthals in Europe and by modern humans in other regions such as the Levant .
A decades-old cosmetic procedure called mesotherapy, which involves injecting unregulated mixtures of vitamins and drugs under the skin to reduce under-eye bags, is regaining popularity in the US.
Lighter Side. Medicare. News. Science & Tech. Shopping. Sports. Weather. The Most Common Reasons People See the Doctor for Scalp Pain. Korin Miller. December 27, 2024 at 6:00 AM.
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