 Under the mud, if you take your shoes off, we have these things. He points. The crawdads. The kids are observant. They examine pieces of wood and rocks. They measure sticks and blades of grass. A number of studies have shown faster cognitive development in children attending outdoor preschools and better motor coordination, even boosted immune systems. Math and learning new vocabulary happen organically here. If you had three prickly pear in your leg...