Science involves the systematic study of facts or truths through observation and experimentation. Scientists are experts in one or more areas of science. The document then profiles several prominent Indian scientists, including C.V. Raman, Homi Bhabha, Subrahmanyan Chandrasekhar, Har Gobind Khorana, Abdul Kalam and Sanjeev Galande, and summarizes their educational backgrounds and contributions to fields like physics, astronomy, nuclear science, and biochemistry.