Couples don't remember the same things — they remember who remembers what
Psychologist Daniel Wegner noticed that long-term couples quietly split up their memory the way they split up chores: one partner becomes the household's expert on finances, the other on birthdays and directions. Neither could recall everything alone, but together the pair outperformed either partner's memory on its own. Wegner called this shared, distributed system 'transactive memory,' later used to explain how work teams remember far more than any one member could.