...and the theories of intelligence they use to measure 'intelligence'. Here, from the new (and very good) Cambridge Handbook of Intelligence.
Bonus fun fact from chapter 3: "Persons with higher IQs apparently are also likely to be taller and have more body symmetry than persons with lower ability scores." [Silventoinen et al. (2006); Prokosch & Miller (2006)]
Health is healthier than sickness.