Philosophy
The Epistemic Value of Testimony and the Ethics of Belief
Quick fact
According to a famous philosophical thought experiment, even if you have no direct evidence, the testimony of a trustworthy person can be enough to justify knowledge—but only if you also have good reason to trust that person.
Why this is interesting
You've never been to the moon, yet you're certain it exists. Nearly everything you believe about history, science, and your own name comes from what others have told you—so how can any of it be considered knowledge?