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updated 2026-09-15

What the site treats as evidence, how sources are graded, and which open questions would most change the answer.

In this section

Scope and coverageThe eleven topics, the question each answers, the standard of detail they are held to, and the limits of the evidence behind them.working Method and source policyWhat the site treats as evidence, how sources are graded, and the rules that keep formulas implementable.working