Replicability is the property of scientific experiments and studies that when you re-run them, you get the same result. It has turned out that many experiments lack this property raising deep questions about how much different scientific findings can be trusted.

The replication crisis identified in the 2010's, particularly for many results in psychology whose models have strong bearing on rationality and have been referenced repeatedly on LessWrong, make the topic a key point of interest for Rationality. 

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