Offered 100 today or 110 tomorrow, many take the 100 now. But offered 100 in 30 days or 110 in 31 days, they choose to wait. It's the same one-day wait for the same gain. Our impatience spikes when a reward is immediate: it's called hyperbolic discounting, and it explains a lot of abandoned resolutions.
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.