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2. Sharpening stone - Wikipedia

   en.wikipedia.org/wiki/Sharpening_stone

   Diamond stones are typically coarser than other sharpeners, and are used for the initial stages of knife sharpening. For a knife that has been previously sharpened, this initial diamond stone stage can often be skipped and the re-sharpening begun with a ceramic stone. Over time diamond stones will wear out and need to be replaced.

3. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Knife sharpener in Kabul, Afghanistan (1961) The Knife Grinder by Massimiliano Soldani (c.1700), Albertinum, Dresden A railway camp cook sharpens a knife blade on a stone wheel, 1927. Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, [1] or a flexible surface ...

4. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   The substance on the sharpening surface must be harder (hardness is measured on the Mohs scale) than the material being sharpened; diamond is extremely hard, making diamond dust very effective for sharpening, though expensive; less costly, but less hard, abrasives are available, such as synthetic and natural Japanese water-stones. Several ...

5. Grindstone - Wikipedia

   en.wikipedia.org/wiki/Grindstone

   The working edge of the hatchet or axe was sharpened by rubbing it against an abrasive stone, eventually leading to the creation of a shallow oval-shaped groove over time, [4] The grooves vary in length from 80 mm (3.1 in) up to 500 mm (20 in), and can be up to 200 mm (7.9 in) wide and 100 mm (3.9 in) deep. They are often found near water ...

6. What is the debt ceiling, and is Trump right that a default ...

   www.aol.com/debt-ceiling-trump-default-could...

   President-elect Donald Trump on Wednesday shone a spotlight on the debt ceiling, rejecting a bipartisan government funding deal negotiated by House Speaker Mike Johnson and demanding lawmakers ...

7. What are the deadliest plane accidents? See list after South ...

   www.aol.com/news/deadliest-plane-accidents-see...

   After over 100 people were killed in a South Korea plane accident, here are the worst accidents and crashes in aviation history.