Science, Evidence, and Explanation
Scientists and philosophers of science use imagined cases to expose hidden assumptions about motion, evidence and explanation. This path moves from motion to confirmation to explanations of design. Distinguish what each case shows from what later physics or biology added.
Learning objectives
- Explain how a thought experiment can test a physical or explanatory claim.
- Separate logical, statistical and causal difficulties in the use of evidence.
- Describe why adaptation and apparent design call for explanation.
Recommended sequence
- Galileo’s Tied Falling Bodies — Begin with an argument that tests a physical claim by contradiction.
- Galileo’s Ship — See why uniform motion cannot be detected from inside the cabin.
- Newton’s Bucket — Ask what rotation is relative to.
- Einstein’s Train and the Relativity of Simultaneity — Examine how simultaneity depends on the observer’s motion.
- Heisenberg’s Microscope — Consider what the uncertainty principle does and does not say about measurement.
- Hempel’s Paradox of the Ravens — Ask what counts as evidence for a generalization.
- Goodman’s New Riddle of Induction (Grue) — Ask which generalizations our evidence should be projected into.
- Simpson’s Paradox — See how aggregated data can reverse a conclusion.
- Paley’s Watch — Study the classical inference from design.
- Darwin’s Imagined Gradations of the Eye — Compare an account of gradual adaptation.
- Leslie’s Firing Squad — Finish with a debate about whether our own existence removes the need for explanation.
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
- Which cases rely on a contradiction, which on a statistical pattern, and which on an analogy?
- What background knowledge did you need to use for each?
Final synthesis activity
Pick a recent news claim that rests on data. Write a short critique that names the relevant puzzle from this path (for example confounding or projectibility), what additional information you would need, and what conclusion you would still accept.
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