If i find the perfect quotation to put in my assignment but can't remember where i got it from, i should not include it in my paper.

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

How can you paraphrase this, this is about golden age fallacies.these are all rational people who know that older is not necessarily better, but many are taken in by this fallacy and seem no longer able to reason with any degree of reliability

Comparing and contrasting is a form of