One of the easiest ways to misunderstand science is to imagine it as a warehouse of facts. A result enters the warehouse, acquires the label scientifically proven, and remains there forever.
That is not how science works.
The National Academies report Reproducibility and Replicability in Science presents a much more interesting picture. Scientific knowledge develops through discovery, confirmation, criticism and correction. New evidence can strengthen an existing explanation, reveal its limits, or occasionally force scientists to replace it.
The report captures this beautifully in three words: scientific knowledge is “durable and mutable.”
Those two qualities might seem contradictory.
Durable means that well-supported scientific knowledge does not evaporate every time a new paper appears. Newtonian mechanics did not become useless when relativity was developed. Existing knowledge survives because it has accumulated evidence behind it.
Mutable means that no scientific claim receives immunity from new evidence.
Better instruments can reveal things that older instruments could not detect. Larger datasets can uncover patterns hidden in small samples. New experiments can identify conditions under which an apparently universal relationship no longer applies.
That ability to change is not a defect in science. It is one of its central strengths.
The report's preface uses changes in nutritional and medical advice to illustrate the danger of speaking too confidently about what we currently believe to be true. Scientific conclusions generally arrive with some degree of uncertainty, and repeated confirmation increases confidence rather than magically transforming a claim into absolute truth.
This is why a paper that overturns an earlier result does not necessarily mean that someone previously failed at science.
Sometimes the new study is wrong.
Sometimes the original study was wrong.
Sometimes both studies are correct under different conditions.
And sometimes the disagreement reveals a variable nobody previously knew mattered.
The scientific process is designed to sort among these possibilities.
The deeper lesson is therefore surprisingly optimistic: science progresses not because scientists never make mistakes, but because scientific claims remain exposed to interrogation.
A scientific result is not carved into stone.
It enters a conversation.
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Further reading: This post is based on Reproducibility and Replicability in Science, a consensus study report of the National Academies of Sciences, Engineering, and Medicine. National Academies of Sciences, Engineering, and Medicine. 2019. Reproducibility and Replicability in Science. Washington, DC: The National Academies Press. DOI: 10.17226/25303.
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