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scientific replication

Room-temperature superconductivity — a material that conducts electricity with zero resistance without requiring extreme cooling or crushing pressure — would be one of the most significant materials science breakthroughs in a generation, with implications for power transmission, magnetic confinement, computing and much else. It is also a claim that has been made, and subsequently withdrawn or discredited, several times over the past few years. The most recent claim to circulate widely follows the same basic pattern as its predecessors, and is worth using as an illustration of how the scientific community actually tests these things, rather than as settled fact in either direction.

• Zero resistance must be shown across a range of temperatures and currents, not as a single measurement.
• The Meissner effect should be demonstrated with proper magnetic field exclusion measurements, not simply a video of a sample appearing to float.
• Independent labs need access to genuine samples or a reproducible synthesis method, not just the original team's data.
• A theoretical explanation, while not strictly required for a valid empirical claim, substantially increases confidence when the numbers make physical sense.