If you are asking for a definition then its the arts and other manifestations of human intellectual achievement regarded collectively.
Hope this helps.
Here is the excerpt from A Rumor of War which best illustrates Vietnam's uncomfortable climate:
<span><em>The tedium was occasionally relieved by a large-scale search-and-destroy operation, but the exhilaration of riding the lead helicopter into a landing zone was usually followed by more of the same hot walking, with the mud sucking at our boots and the sun thudding against our helmets while an invisible enemy shot at us from distant tree lines.</em></span>
I feel the best answer is B) have food allergies.
It is not a problem for students who do not eat lunch so we can rule out C
It does not mention anything about the cost involved so that rules out D
It is a problem if you don't like fish, however, there are a large number of people who have nut allergies and if peanut butter squares are being prepared around any of it that could be an issue.
I do believe the early Egyptians, being as smart as they where used a interesting method of a sundial. It caught the suns shadow and they where able to use it to tell the time.
