Category: Science
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PSLE Science Reality Lab Vol No.160 | “Satellite NO₂ Is High Here” — Is That the Same as Ground-Level NO₂ Concentration?
PSLE-SCI-REALITY-0160. A Primary 5/6 guide to satellite nitrogen-dioxide maps: why a tropospheric NO₂ column is not automatically the same as an exact ground-level concentration, and how units, time and vertical distribution affect the claim.
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PSLE Science Reality Lab Vol No.159 | “This Is a Historical Weather Map” — Was Every Grid Cell Directly Measured?
PSLE-SCI-REALITY-0159. A Primary 5/6 guide to historical weather reanalysis: why a value in every grid cell can be a model-assisted estimate constrained by observations rather than a direct measurement at every location.
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PSLE Science Reality Lab Vol No.158 | “This Red Square Is a Fire Hotspot” — Is the Whole Square Burning?
PSLE-SCI-REALITY-0158. A Primary 5/6 guide to satellite fire-hotspot maps: why a red pixel marks a thermal detection footprint, not proof that the whole square is burning or that its centre is the exact fire location.
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PSLE Science Reality Lab Vol No.157 | “100% Inspected” — Does That Guarantee Every Defect Was Found?
PSLE-SCI-REALITY-0157. A Primary 5/6 guide to “100% inspected” quality claims: why checking every unit does not guarantee every defect was detected, and why method capability still matters.
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PSLE Science Reality Lab Vol No.156 | “R² = 0.90” — Does That Mean 90% of the Predictions Were Correct?
PSLE-SCI-REALITY-0156. A Primary 5/6 guide to R² in scientific reports: why R² = 0.90 does not mean 90% of predictions are correct, and why residuals, validation and range still matter.
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PSLE Science Reality Lab Vol No.155 | “This Dot Is Beyond the Box-Plot Whisker” — Does That Mean the Measurement Is Wrong?
PSLE-SCI-REALITY-0155. A Primary 5/6 guide to box-plot outlier flags: why a point beyond a whisker is evidence that a value is unusual, not automatic proof that the measurement is wrong.
