A child's world: how young children learn -- Nurturing child development: environments that promote learning -- The process of problem solving for children -- Measurement: a way to capture observation in mathematics and science -- Organizing data in science and mathematics -- Criteria for developing concept explorations -- Math/science concept exploration: astronomy and space science -- Math/science concept exploration: birds -- Math/science concept exploration: clouds -- Math/science concept exploration: insects -- Math/science concept exploration: leaves -- Math/science concept exploration: light and color -- Math/science concept exploration: rocks -- Math/science concept exploration: seeds -- Sun and shadows -- Math/science concept exploration: toys and tools -- Math/science concept exploration: water -- Math/science concept exploration: the wind goes woo-oo