Can someone who isn't considered a "genius" still make a big impact in mathematics, like Richard Feynman did in physics?

How can you support a friend that you know is making a wrong decision by leaving the love of his life just because he’s parents say they will be hurt and unhappy if he chooses to stay with that person just because they want to control his decision?
Is it possible that people who refuse to use their bodies the way they are supposed to be used are reducing their natural physical abilities and the length of their lives?
Is it true that they’re making Trump put more electric vehicles on the market rather than putting electricity where it is supposed to be from an environmental standpoint?