aircrib -> invention by B. F. Skinner in which he raised his second daughter. "Warm air, moved by convection or a fan, depending on the outside temperature, rises through a tightly stretched woven plastic sheet surrounded by clear plastic or glass walls which provide a soundproof and germ-free environment for growth and development."
Ego identity -> Erik Erikson's Childhood and Society characterizes the final stage of life with either this or despair, depending on whether or not the individual is able to accept the life he has led.
Rational will -> conscious choice of means to a specific end. Gesellschaft is based on rational will, as opposed to Gemeinschaft. Also known as krwille in German.