the.com/determination
the quiet engine that turns no into not yet and again into done.
brain chemistryDopamine spikes from pursuit, not just reward.
grit beats IQPersistence predicts success better than raw talent.
sunk costDetermination's evil twin keeps you in bad bets.
marshmallow mythFamous willpower test mostly measured trust and wealth.
physical limitMost quit at 40% of true capacity.