sorry i could only think of one reason. ByViliami
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history is a waste of time.
This means that if you purposely waste something, you will need what you wasted one day.
Not a complete waste of time. Although the Europeans never recaptured the Holy Land, they were introduced to the intellects of the Muslims, which led to their revival (in learning) since the Muslims preserved Western ideas.
In the middle ages city dwellers were crowded together and usually had unclean water supplies. They had no knowledge of the causes of disease so could not do things to prevent diseases spreading, such as collecting waste and keeping it away from their water supply.
"The mind is a terrible thing to waste" was a phrase that was coined by the United Negro College Fund. This group used this phrase in 1971 as part of their campaign to raise funds for college scholarships.