The question of whether we can determine what we do not know is one that has interested many philosophers. Skepticism, types of ignorance, knowledge that has existed in the past or will exist in the future and knowledge of history, truth, science and human consciousness are among topics discussed. The question of whether knowledge is even desirable in all cases is examined with the question of why human beings have such a difficult time getting along without killing one another. UNESCO's philosophical program is also discussed.