Very young children are extraordinarily trusting of what adults tell them, even if there is repeated evidence to the contrary, finds a new study.
The children who saw the adult place the arrow on the incorrect cup quickly learned not to trust this sign. But those who heard the adult say the sticker was under a certain cup continued to believe that's where they would find the sticker.
Of those 16 children, nine never once found the sticker in eight tries. (At the end of the game, all the children were given stickers, whether they found them or not.)