A famous 1977 study in Science showed babies two to three weeks old sticking out their tongues or opening their mouths after an adult did: imitation seemed to be inborn. In 2016, an Australian team filmed 106 babies at 1, 3, 6 and 9 weeks of age watching a whole series of gestures. They stuck out their tongues just as often in response to other gestures. Supporters of newborn imitation dispute the analysis, and the debate continues.
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.