Edit 3: I’ll be able to see new colors. I’ll be able to know how is it like to travel in a speed faster than the speed of light. I’ll be able to understand & comprehend 4th, 5th dimensions. I’ll be able to intervene with world’s history in any way I like, like back then when John F Kennedy was assassinated for issuing Executive Order 11110, and I was there to catch the bullet & safe his life, and I’ll inform him what’s truly happening, and watch how the world turns out if he successfully dissolve the Federal Reserve, and run USA’s honest monetary & economic system . I’ll be able to inform the guys at D day on both sides, what’s truly happening behind the scenes, so when the allied troops confronts opposing troops, they would all have picnic together instead at the beach, eating & sharing their rations.
Edit 4: I’ll get to know what will happen if I introduce electromagnetism to Sir Isaac Newton, heck, I want to know what will happen if I introduce electromagnetism to Galileo Galilei.