A Tribute on his Birthday     to An Eminent Sikh Scientist Dr Kartar Singh Bawa (1886-1960)                      By         Dr Surjit Singh Bhatti Dr Bawa Kartar Singh, a direct descendent of Guru Amar Das, the Third Sikh  Guru, was a great scientist, born on  the 17th of April 1886 at Amritsar.  His father Bawa Jivan…