His father , Parmeshwari Sahai Bhatnagar , died when he was eight months old .
He spent his childhood in the house of his maternal grandfather , an engineer , who helped him develop a liking for science and engineering .
His father , Parmeshwari Sahai Bhatnagar , died when he was eight months old , and he spent his childhood in the house of his maternal grandfather , an engineer , who helped him develop a liking for science and engineering .