[JoeAltmaier]

"Among the Wakashan Indians of the Pacific Northwest, a grammatically correct sentence can’t be formed without providing what linguists refer to as “evidentiality,” inflecting the verb to indicate whether you are speaking from direct experience, inference, conjecture, or hearsay"

This is amazing. But I can't grasp the difference between inference and conjecture - they are both 'figuring out' what happened rather than knowing or hearing?