Science is our best tool for understanding the natural world. But what makes something scientific? How do we know when a theory is good? Philosophy of science examines these foundational questions.
The Demarcation Problem
What distinguishes science from non-science or pseudoscience? This is called the demarcation problem.Falsifiability (Karl Popper)
A theory is scientific only if it could, in principle, be proven false. Evolution is scientific because we could find evidence that would refute it (like a rabbit fossil in Precambrian rock). Unfalsifiable claims like "invisible beings guide everything" are not scientific. Key insight: Science advances by trying to prove theories wrong, not by confirming them.Paradigm Shifts (Thomas Kuhn)
Science does not progress linearly. It goes through "normal science" (puzzle-solving within a paradigm) until anomalies accumulate and a "scientific revolution" replaces the old paradigm with a new one. Examples: Ptolemaic to Copernican astronomy, Newtonian to Einsteinian physics.The Problem of Induction
How do we justify believing the future will resemble the past? David Hume showed this is a problem: we cannot prove induction works without using induction (circular). Science proceeds as if induction works, and practically, it does. But philosophically, there is no airtight proof that past patterns will continue.Theory-Ladenness
Observations are not neutral. What we see is influenced by our theories. Two scientists with different theories may literally "see" different things when looking at the same data. This does not mean science is arbitrary. Experiments can still surprise us and force theory changes.Scientific Realism vs. Anti-Realism
Realism: Scientific theories describe real entities. Electrons, genes, and quarks actually exist. Anti-Realism: Science is just a tool for prediction. We cannot know if theoretical entities are real; we only know theories work. Most working scientists are realists. The success of science suggests theories are at least approximately true.Why This Matters for Secular Living
Understanding philosophy of science helps us:- Distinguish science from pseudoscience
- Appreciate scientific uncertainty without dismissing science
- Understand why scientific consensus matters (but is not infallible)
- Recognize that "I do not know" is a valid and honest answer
- See science as a self-correcting process, not a collection of dogmas