Sacrifice means giving up something in return for another thing that is worth much less (or nothing) in value. Most people, especially on HN, would argue that

Sacrifice means giving up something in return for another thing that is worth much less (or nothing) in value. Most people, especially on HN, would argue that the Apollo program has yielded enormous benefits for America. And it cost only $25 billion - about as much as Trump’s border wall (the cost estimates for which are most likely grossly optimistic).