He was surprised to see me and tried to hide a small object in his pocket.

VOA: special.2009.07.25

Before six-month-olds, Piaget observed, you take an object the kid likes like a rattle, you hide it, you put it behind something, it's like it's gone.

皮亚杰发现,在六个月之前,你将婴儿喜欢的物体,比如说拨浪鼓,藏起来,隐藏在某物的后面,就像这东西消失了一样

耶鲁公开课 - 心理学导论课程节选

Those who have nothing to hide should not object?

BBC: E-mail: Who's reading yours?