Benjamin Franklin
While his electrical work was his greatest scientific achievement, Franklin also contributed to knowledge of heat conduction, storms, the Gulf Stream, etc., and invented bifocal glasses, the rocking chair, daylight saving time, and more. He might have done more still, but after he had been working for only a few years on electricity, his country called him to other tasks. He put aside his researches reluctantly and even into his old age kept hoping to return to them.