A multifaceted personality - scientist, visionary and institution builder, Homi Jehangir Bhabha was born on October 30, 1909.He is known as the chief architect of India`s nuclear programme. He also established two great research institutions – namely the Tata Institute of Fundamental Research, and the Atomic Energy Establishment at Trombay. He played a crucial role in the development of electronics in India. He derived a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha Scattering. His classic paper, jointly with W. Heitler, published in 1937, described how primary cosmic rays from space interact with the upper atmosphere to produce particles observed at the ground level. In 1938 Bhabha was the first to conclude that observations of the properties of such particles would lead to the straightforward experimental verification of Albert Einstein`s theory of `relativity`.