Discoveries in the field of chemistry

5 chemistry discoveries that changed the world are:

1. The first discovery was penicillin. It was discovered on Friday, September 28 by Alexander Fleming. He discovered it by observing a mould that was mistakenly left out and was growing around a Petri dish.
2. The second discovery was the Haber-Bosch Process. In short, it is the combustion of atmospheric hydrogen with nitrogen to produce ammonia. This played a pivotal role when it was turned into a crop fertilizer, giving consumable plants the ability to intake nitrogen.
3. The third discovery is polythene. From hard hats to plastic bags, it's the most common plastic found in products today. In 1898, Hans von Pechmann discovered something waxy at the bottom of his tube. The funny thing is that he was studying something completely different, making the discovery accidental. He and his fellow scientists studied the substance and found out that it was composed of very long molecular chains. These chains were later termed polymethylene. 
4. The fourth discovery would have to go to radiation. The study of radiation took many years. In 1896, Henri Becquerel began studying the properties of x-rays by using naturally fluorescent minerals. He then did an experiment using potassium uranyl sulfate on photographic plates in which he wrapped the plates in black paper and exposed them to sunlight. He originally thought that the uranium would absorb the sun rays in which they would be emitted as x-rays. 
5. The final discovery that has played a role in all of our lives in the 21st century is the LCD screen. This dated back to the 1960s in Britain. The British Military wanted new flat screens in vehicles rather than the old bulky and rather expensive cathode ray tubes. This brought up the discussion of Liquid Crystal Displays, or LCDs.