How quickly they grow up.
The study, by Dr Melissa Bateson and team, is believed to be the first to test how cues of being watched affect people’s tendency for social co-operation in a real-life setting.
And I think I remember that advert too, the one with the little girl plucking petals off a daisy. I cannot see how to embed the film directly, and as I found it from the excellent Human Flower Project, you can too.