The sperm cell is the smallest cell in the human body. The volume of these cells is quite tiny. The head of a sperm cell is roughly 4 micrometres long, about the same size as a red blood cell (RBCs). Egg cells are the biggest cells in the human body (ovum).

The father of the Indian Space Programme is often considered to be:

(C) Vikram Sarabhai

Dr. Vikram Sarabhai, an eminent scientist, visionary, and the founder of the Indian Space Research Organisation (ISRO), is widely regarded as the father of the Indian Space Programme. He played a pivotal role in establishing and nurturing India's space capabilities. Dr. Sarabhai was instrumental in the launch of India's first satellite, Aryabhata, in 1975, marking a significant milestone in the country's space exploration journey. His vision and leadership laid the foundation for the development of ISRO and the growth of India's space capabilities, making space exploration an integral part of the country's scientific and technological advancements.