The Greatest Invention in the Past Century Teacher Lou There are many amazing inventions in the last century. The most important invention, I think, is synthetic plastics. In 1910, the synthetic plastics was first invented by an American chemistwho named Leo Baekeland.The plastic is phenolic resin. Eight years later, anAustriachemist called john invented urea resin. The plasticsis made ofurea resin have the properties oftransparent and light resistance compare with the first one. What’s more, they are nonflammable, lighter, cheaper, higher strength and hardness. The anther most important property is that plastics are anon-conducting materials.At a later time, different plastics that adapted different needs are invented one by one. With those advantages, plastics are used every aspects in our life and produced different goods. Like the surface of electric wire, the shell of computers, the parts of all kinds of household appliances and the articles for daily use. For itself properties of stably, it can be used to packed foods. Without plastics, our daily life maybe become very inconvenient, and other materials which more heavily or light but expensive such as magnesium alloy have tobe used to product products. Even now, new materials haven’t be found to replaces it. Because plastic are so stably, the nature environment unable to degradation it. The environment is serious polluted by plastics products that is optionally dropped by human. So, for our environment, plastic should be classification collection. 本文来源：https://www.wddqw.com/doc/e296382a6f85ec3a87c24028915f804d2b16879e.html