Philosophy
The Epistemology of Testimony and the Transmission of Justification
Quick fact
The philosophical debate about testimony asks whether a hearer's belief can be justified merely because a speaker tells them something true, even if the hearer has no independent evidence. This is not settled: some philosophers argue that testimony transmits justification only if the hearer has positive reasons, while others say we are entitled to accept what we're told unless we have reason not to.
Why this is interesting
Think of a time you knew something because someone told you. Did you really know it, or were you just taking their word for it? How can someone else's justified belief become your justified belief?