Question

who according to u all was the greatest scientist of all time?

Answer 1

Albert Einstein is greatest scientist all over world.
apj Abdul kalam in india

Answer 2

Nikola Tesla, according to me, was the greatest scientist and inventionist of all time.
Unlike any other scientist or inventor, he wasn't that good in performing mathematical calculations and science. So he created his own ways to understand the laws of the Universe. Also, his brain was so developed and was so psychic that he used to get his ideas by intutions.
He used to propose his inventions only by reading ancient books from Indian Mythology, like The Gita, The Vedas, Vimanika Shastra etc.