The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool the truest heroism is to resist the doubt and the profoundest wisdom to know when it ought to be resisted and when it be obeyed.
Half of Google's revenue comes from selling text-based ads that are placed near search results and are related to the topic of the search. Another half of its revenues come from licensing its search technology to companies like Yahoo.
