Reality, Knowledge, and Skepticism
Begin with radical doubt, then narrow the question to what makes an ordinary belief count as knowledge. Distinguish a skeptical possibility from evidence that the possibility is actual.
Learning objectives
- Separate truth, justification, knowledge, and certainty.
- Explain epistemic luck.
- Assess whether changing a description changes a skeptical argument.
Recommended sequence
- The Dream Argument — Ask how waking belief could be distinguished from a dream.
- Descartes’s Evil Demon — Consider doubt even when reasoning seems clear.
- Brain in a Vat — Compare a technological scenario with the demon.
- Gettier Cases — Test justified true belief without radical skepticism.
- Fake-Barn Country — Ask whether an unreliable environment defeats knowledge.
- Molyneux’s Problem — Consider the relation between senses and learning.
Read each article’s scenario first, write an initial answer, and then read the interpretations and sources. Spend as long as useful; there is no required schedule.
Reflection questions
- Must knowledge rule out every conceivable alternative?
- How does luck differ in the Gettier and fake-barn cases?
Final synthesis activity
Construct an argument map for one skeptical claim: premises, conclusion, and two possible objections. Then give an ordinary example where you would still claim knowledge. Explain whether that is a contradiction or a change in standards.
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