Lift two boxes of equal mass, one small and one large, and the small one feels distinctly heavier. First described in 1891 by French physician Augustin Charpentier, the illusion persists even when you know the weights are identical. A 2000 study showed that your fingers quickly adjust their grip to the true weight. The brain corrects the movement, but not the sensation.
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.