Seeing into the future and acting accordingly. No other species does this.
Savings and investment, delayed consumption. Better uses of energy can be imagined and ran through thought experiments. Deferring gratification leads to savings which in turn lead to investments, the Lynchpin of the creative endeavor. That's one characteristic that makes Homo sapiens the apex predator. We outcompeted all rivals. Darwin's survival of the fittest, or survival of the smartest. Oh yeah, that demonstrates another characteristic championed by Gen-X: brains over brawn.