Writing "Since" for "Because"
Although that website refers to "academic sources", I can find no credentials for the site's administrators or content providers. So, I'd go with the library's usage views. If you look up "since" in "The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved...." at Answers, for example, you'll find the word listed mostly (seven of eight meanings) as an indicator of time passed.
"Since" can be used as an adjective, a preposition, or a conjunction, and two of the three conjunction uses are time-related. In the example the dictionary provides for the use of "since" to mean "inasmuch as" or "because", the example places the conjunction at the beginning of a sentence: Since you're not interested, I won't tell you about it. No, seriously, that is the example sentence given!
In light of the facts that so much of the meaning of "since" has to do with time, try to avoid using it to indicate causality. When you're tempted to use it, take a pause and type "because".














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The
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If you're an Anglophile or a lover of the English language, you might enjoy Michael Quinion's