The Day 23 December in History

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The Life of Thomas Edison (1847-1931)
23 December 1878 He invented Gramophone
Thomas Edison invented his tin-foil phonograph, Edison's phonograph was followed by Alexander Graham Bell's graphophone. In 1887 Emile Berliner invented the gramophone and records.
He was a poor student. When a schoolmaster called him "addled," his furious mother took him out of the school and proceeded to teach him at home. Thomas Edison said many years later, "My mother was the making of me. She was so true, so sure of me, and I felt I had some one to live for, some one I must not disappoint." At an early age, he showed a fascination for mechanical things and for chemical experiments.
• Biography
Born on February 11, 1847 in Milan, Ohio; the seventh and last child of Samuel and Nancy Edison. When he was seven his family moved to Port Huron, Michigan and Edison lived there until he struck out on his own at the age of sixteen. He had very little formal education as a child, attending school only for a few months. He was taught reading, writing, and arithmetic by his mother, but was always a very curious child and taught himself much by reading on his own. This belief in self-improvement remained throughout his life.
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Plastic Made On 23 Dec 1932
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic, most commonly derived from petrochemicals, but many are partially natural.
Early plastics were bio-derived materials such as egg and blood proteins, which are organic polymers. Treated cattle horns were used as windows for lanterns in the Middle Ages. Materials that mimicked the properties of horns were developed by treating milk-proteins (casein) with lye. In the 1800s the development of plastics accelerated with Charles Goodyear's discovery of vulcanization as a route to thermoset materials derived from natural rubber. Many storied materials were reported as industrial chemistry was developed in the 1800s. In the early 1900s, Bakelite, the first fully synthetic thermoset was reported by Belgian chemist Leo Baekeland. After the First World War, improvements in chemical technology led to an explosion in new forms of plastics. Among the earliest examples in the wave of new polymers were polystyrene (PS) and polyvinyl chloride (PVC). The development of plastics has come from the use of natural plastic materials (e.g., chewing gum, shellac) to the use of chemically modified natural materials (e.g., rubber, nitrocellulose, collagen, galalite) and finally to completely synthetic molecules (e.g., bakelite, epoxy, polyvinyl chloride).
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