Definition
Scientific skepticism is the stance of holding beliefs provisionally and proportioning confidence to the strength of the evidence. It treats doubt as a method rather than a destination: a tool for testing claims, not a blanket refusal to believe anything.
This distinguishes it sharply from cynicism. A cynic rejects claims by default; a scientific skeptic suspends judgment until the evidence is in, then believes as much as the evidence warrants — and is willing to revise that belief when better evidence appears. Skepticism in this sense is open-minded, but it sets a price of admission for belief.
Why it matters
How it works
In practice, scientific skepticism asks two questions of any claim: how strong is the evidence, and how surprising is the claim. A modest, expected claim needs only modest support. A claim that contradicts well-established knowledge needs evidence strong enough to overturn that knowledge — this is the principle that extraordinary claims require extraordinary evidence.
Crucially, the skeptic's belief stays provisional. New evidence can raise or lower confidence at any time, and the willingness to revise is what keeps skepticism a method rather than a dogma of its own.