Even within a single family, evolution encourages "adaptive divergence." Like Darwin’s finches developing different beaks to eat different seeds, siblings often develop different personalities to avoid direct competition for parental attention and resources.
Why isn't everyone the same? If evolution favors the "best" traits, you might expect human personality to have converged into one perfect, ultra-adaptive type by now. The Evolution of Personality and Individual Dif...
In times of , aggressive "get-it-now" personalities might thrive. Even within a single family, evolution encourages "adaptive