Chemistry is the science of the composition, structure, properties and reactions of matter, especially of atomic and molecular systems. The synthesis of new drugs, the production of novel materials and the monitoring and improvement of our environment all involve the science of chemistry. The modern-day subject of chemistry is a dynamically-changing science that is about cutting-edge discoveries and the use of state-of-the-art techniques and technologies that impact almost every aspect of human life and almost every aspect of the development of human society. It is easy to understand why the field of chemistry is often described as the central science.