Does a fact need to be grounded in personal experience? I know that 10 gigabit ethernet exists, but I have never actually experienced it. Likewise, I know that

Does a fact need to be grounded in personal experience? I know that 10 gigabit ethernet exists, but I have never actually experienced it. Likewise, I know that a degree in history increases someone's expected earnings much less than a degree in nuclear engineering. Even though I have no personal experience in those areas.