We walk around the world with a bewildering network of opinions, beliefs and judgments, some of them ephemeral (I think that I won’t need an umbrella today) and some vital (I trust that person).
Why is the sky blue? Why do you believe you are mortal? Why is four twice two? How do you know that George Washington actually existed?
If we have an opinion about such a question, then when we are challenged, we offer what we think counts for evidence. We hope, of course, that our evidence persuades…
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