Whom do you think the BEST scientist in this World who evaded lot of challenges?

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in my view..STEPHEN HAwking is the best scientist who evaded his mentally retarded capability..he could be the best scientist forever who achieved best success in almost all the aspects in SPACE research...he dedicated his life to achieve success in that particular field...he not only achieved success in Science .. he also launched his success in his personal life...He was a mentally retarded person still his interest made him achieve undefeated success,, he operated every thing with his mind only...the helping hand was given to him by his father...