A young child shown a nine-inch round bowl and a six-inch round bowl containing equal amounts of popcorn says he is certain the smaller bowl has more popcorn than the larger bowl. This child has yet to acquire what Jean Piaget called
A young child shown a nine-inch round bowl and a six-inch round bowl containing equal amounts of popcorn says he is certain the smaller bowl has more popcorn than the larger bowl. This child has yet to acquire what Jean Piaget called