In the 1950s, Solomon Asch asked people to compare line lengths, a task everyone gets right alone. But the other participants were actors who unanimously gave a wrong answer. About 75% of real participants went along with the group at least once. Yet a single ally telling the truth was enough to make conformity collapse.
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.