Listen: bed, rest, tired, dream, pillow, yawn, nap… Now recall the list. In Roediger and McDermott's experiments, about half of participants “remembered” the word “sleep,” which was never said, often with as much confidence as the real words. Memory stores the gist, then rebuilds details that fit it.
Remembering is not replaying a recording — it is rebuilding. Each time you recall a memory, it becomes temporarily malleable and can be altered before being stored again. That is why two people can sincerely remember the same event… differently.
In 2003, Johnson and Goldstein compared European countries. Where you must tick a box to become a donor, consent rates ranged from 4% to 28%. Where you're a donor by default unless you opt out, they topped 85%. People aren't more generous on one side; most simply stick with whatever option was chosen for them.