Princess of Wales Catherine 'Kate' Middleton's second and last day in the Italian city of Reggio Emilia focused on the part Nature has to play in the Reggio Approach to early education and development that the British royal is studying for her foundation on the same themes.     The environment and nature as a "third teacher" in children's first relationships and experiences is one of the pillars of the Reggio Emilia Approach, the educational philosophy that characterizes the city's municipal