replication-crisis

Walter Mischel's 1972 marshmallow test predicted life outcomes from a single moment of self-control. A 2018 replication of 918 children changed the story.

David Rosenhan's 1973 Science paper sent 8 pseudopatients into psychiatric hospitals. It changed psychiatry — until a 2019 investigation found the data may not hold up.

Pick any health topic and you'll find conflicting studies, contradicting experts, and headlines that seem to reverse themselves every few years. Is science broken — or is this exactly how it's supposed to work?