I did some research on Dr, Nash, who was a Nobel prize winner, and his famous paper "Equilibrium points in n-person games" published in 1950 when he was only 22 years old. Basically, in a game, players could reach equilibrium benefit if they make decisions with the thinking of others' benefit. This is the exact situation for covid vaccine. All of us are in the "game", and everyone's decision will determine the result of all, to get the best outcome, everybody has to think and act selflessly......