4 In what sense is it true that human beings make more "mistakes" than 

 members of other species? Why is that not a handicap in the struggle for existence? 



5 In what way does the fun of running or swimming differ from the fun of 

 running or swimming in a race, and from the fun of watching a race or watching a 

 motion picture of others in action? 



6 What is there to show that painful or pleasurable feelings are possible with- 

 out the direct stimulation of sensory nerves? 



7 What scientific discoveries have helped to reduce mental and physical 

 suffering associated with disease or injury? 



8 In what ways do human satisfactions increase from our living in society? 

 In what ways do they suffer from this fact? 



9 How is material wealth related to happiness? How is it possible to be happy 

 without wealth? How is it possible to have abundant wealth without being happy? 



10 What are some of the obstacles to the wider use of our material and cul- 

 tural resources? 



11 In what sense are the things people do for fun as important as "necessary" 

 work? 



675 



