If psychological egoism is true, then why can't it be our duty to be altruistic?
a. because psychological egoism says that acting altruistically doesn't make us better off
b. because then altruism would be impossible and we aren't morally required to do the impossible
c. because according to psychological egoism, an act is right just in case it is self-interested
d. all of the above

Why does c. wright mills identify critical thinking as one of the most important criteria for the development of intellectual craftsmanship? why is constantly being aware of the biased nature of your reactions and interactions (what c. wright mills calls self-reflexive) key to the development of that critical thinking? finally, why is keeping a file important, how can it lean to intellectual curiosity which can foster critical thinking and to develop a keen analytical mind?