increasing the availability of something that has a positive impact on a living thing's survivial can have a positive impact on that living thing's survival
spouse has effect_of_happiness one_step_to_good_attitude is create_happiness_for_other_people. one_step_to_good_attitude is not create_happiness_for_other_people. telling_joke has effect_of_making_people_laugh delight is cheerfulness. telling_joke has not effect_of_making_people_laugh cheerfulness is happiness. one_thing_makes_people_happy is not having_hobby. one_thing_makes_people_happy is having_hobby.