In 2001, researchers in Bordeaux served 54 oenology students a white wine, then the same wine tinted red with a tasteless, odorless dye. Describing it, the students switched to red-wine vocabulary, citing red-fruit aromas that simply weren't in the glass. What you see shapes what you smell and taste, even for trained palates.
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.