Read a list of words, then recall it: you'll mostly remember the first and last ones. Early items got rehearsed; final items are still in short-term memory. Proof: if you count backward for 30 seconds before recalling, the advantage of the last words vanishes. The middle of a presentation is the worst slot to be in.
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.