Examlex
He was the first to prove that comets lie beyond Earth's atmosphere.
Tuition
The fee charged for instruction or teaching, commonly associated with educational institutions.
Books
Physical or digital publications consisting of written, printed, or illustrated works for the purpose of reading or studying.
Natural Resources
Natural resources, including minerals, forests, water, and productive soil, that exist in the environment and are utilized for economic advantages.
Opportunity Cost
The cost of foregoing the next best alternative when making a decision.
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