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This has nothing to do with science, however your thoughts on words trigger a question I always wanted to ask. Succinctly, why use mendacious when lying is what we mean?

Thanks for asking!  I will gladly answer any word questions I can, science and math related or not.  The answer to your question is actually very straightforward:  mendacious is an adjective and lying is the present participle of the verb to lie.  Contextually mendacious will be modifying a noun-a mendacious student or a mendacious lover-while lying as a present participle can be used like an adjective or like a verb.  For an adjectival example: Jack is a lying sack of... When it acts like a verb:  Jim was lying.  There is a little bit more to it than that, but you wanted it succinctly…

You are right in thinking that they are both mostly synonymous.  

I welcome all word questions and will answer them as best I can!

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