After an amputation, most patients keep sensing the lost limb: it itches, moves, and for many it hurts. The brain keeps its map of that limb and still activates it. In the 1990s, Vilayanur Ramachandran built a mirror box: seeing the reflection of the intact hand where the missing one should be eased the pain for some patients.
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.