Flash letters in the middle of a screen, about ten per second, and ask people to spot two targets. If the second one appears roughly 200 to 500 milliseconds after the first, it is very often missed, though it's easily seen a little later. Described in 1992, this “attentional blink” shows that processing one item ties up the brain for a brief moment, during which it is nearly blind to everything else.
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.