Category: Science
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PSLE Science Reality Lab Vol No.132 | “Mass Balance Accounts for 92%” — Does the Missing 8% Prove It Was Destroyed?
A Primary 5/6 PSLE Science Reality Lab guide to mass-balance claims: learn why an unaccounted 8% can reflect unmeasured pathways, storage, sampling or measurement uncertainty rather than proving material was destroyed.
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PSLE Science Reality Lab Vol No.131 | “The Sample Was Homogenised” — Did Mixing Make Every Part Represent the Original Material?
A Primary 5/6 PSLE Science Reality Lab guide to homogenisation and subsampling: learn why mixing can make a small laboratory portion more representative of a collected sample while also hiding where local hotspots originally were.
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PSLE Science Reality Lab Vol No.130 | “Below the Detection Limit” — Is It Scientific to Enter Zero Before Calculating the Average?
A Primary 5/6 PSLE Science Reality Lab guide to non-detects: learn why “below the detection limit” is not automatically zero, and how replacing non-detects with zero can change an average, graph or scientific claim.
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PSLE Science Reality Lab Vol No.129 | “AQI Doubled From 50 to 100” — Did the Pollution Double?
A Primary 5/6 PSLE Science Reality Lab guide to scientific indices: learn why a change in AQI is not automatically the same proportional change in pollutant concentration and how to read the underlying scale, pollutant and breakpoints.
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PSLE Science Reality Lab Vol No.128 | “The Study Was Retracted” — Does That Prove the Opposite Claim Is True?
A Primary 5/6 PSLE Science Reality Lab guide to retracted studies: learn how to check why a paper was retracted, what evidence becomes unreliable, and why retraction does not automatically prove the opposite scientific claim.
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PSLE Science Reality Lab Vol No.127 | “>100” — Does That Mean the Result Is Exactly 100?
A Primary 5/6 PSLE Science Reality Lab guide to right-censored scientific results: learn why “>100” means the value is above a reporting boundary, not exactly 100, and how that changes comparisons and conclusions.
