How can you tell good science from bad science?

Good science lets you see how someone moved from evidence to a conclusion, and it leaves room for others to check the move. Start with four questions: What exactly is claimed? What was measured or observed? Could something else explain the result? Have independent researchers tested it? A dramatic headline or a respected scientist can draw your attention, but neither answers those questions.

There is no single recipe called “the scientific method” that everyone follows in order. A physicist may run a controlled experiment. An astronomer may compare light from distant objects because she cannot move a star into a lab. A geologist may study layers left by events long past. The National Academies says there is no single set of methods used across all of science. What joins them is careful evidence, reasoning, and testing that other people can examine.

Good work describes how the data were collected, what was left out, how the analysis was done and how uncertain the result is. The conclusion should match the strength of the evidence. One study may show a correlation, meaning two things change together. That alone does not show one caused the other. A careful author tells you what the study can and cannot rule out.

Science also gains strength over time. Another team may repeat the work with new data. Researchers may combine several studies or test the idea in a different way. Sometimes a result fails to hold up. That does not make every first study dishonest or every later study final. It means the evidence is being checked. Peer review can catch some problems before publication, but it is not a certificate of certainty. The most useful habit for a reader is to ask whether the claim remains convincing after someone tries to find a better explanation.