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A pencil (/ ˈ p ɛ n s ə l / ⓘ) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface.
700 BC: Pell's equations are first studied by Baudhayana in India, the first diophantine equations known to be studied. [19] 700 BC: Grammar is first studied in India (note that Sanskrit Vyākaraṇa predates Pāṇini). [20] 600 BC: Thales of Miletus is credited with proving Thales's theorem. [21] [22] [23]
During the 1860s, people typically wrote with quill pens and ink even though Dixon introduced graphite pencils in 1829. But the American Civil War created a demand for a dry, clean, portable writing instrument and led to the mass production of pencils. At the time of Dixon's death in 1869, the Joseph Dixon Crucible Company was the largest ...
Nov. 19—Aaron Bartholmey, of Colfax, can now officially say he has the largest pencil collection in the whole world. After a prolonged public counting event in July, Guinness World Records has ...
During the campaign in Western Europe in 1944–1945, penicillin was widely used both to treat infected wounds and as a prophylactic to prevent wounds from becoming infected. Gas gangrene had killed 150 out of every 1,000 casualties in the First World War, but the instance of this disease now disappeared almost completely.
Aaron Bartholmey started a pencil collection after a Christmas gift from his first-grade teacher. Three decades later, he has a Guinness World Record. This Iowan has collected pencils for 30 years.
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These timelines of world history detail recorded events since the creation of writing roughly 5000 years ago to the present day. For events from c. 3200 BC – c. 500 see: Timeline of ancient history; For events from c. 500 – c. 1499, see: Timeline of post-classical history; For events from c. 1500, see: Timelines of modern history