Sourcing
Factual claims in X9M8 articles link to the page they come from, at the point where the claim is made, and the sources are listed again at the end. Primary sources (statutes, court opinions, datasheets, agency releases, peer-reviewed papers, company filings) are preferred over commentary. News items name the original report.
Quotations
Quotes are exact, short and attributed, with a link at the quote.
Dates
Articles show the date published. Where a law, price or specification can change, the article says when it was checked.
Law, markets and health topics
Law articles are general information, not legal advice. Articles that touch on markets, pricing or investment say so.
Reviews and affiliate links
Some product links are Amazon affiliate links, marked “affiliate link” beside the link. The site may earn a commission on qualifying purchases at no extra cost to the reader. Affiliate relationships do not decide what is reviewed or what the review says. See the Affiliate Disclosure.
Tools
Each calculator states the formula or rule it uses, the source of any figures built into it, and what it leaves out.
Research Papers
These are longer analyses labeled as such, with their methods and limits stated at the start.