In 1964, psychologist Roger Shepard stacked tones an octave apart, with the very lowest and highest ones faded out. Shift them all upward together and you get a sound that seems to climb forever while constantly looping back to where it started. The “Shepard tone” is the auditory version of an endless staircase. Hans Zimmer used it to build the relentless tension of the score for Christopher Nolan's Dunkirk (2017).
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.