Category: Science
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PSLE Science Reality Lab Vol No.338 | “ISO/IEC 17025 Accredited Laboratory” — Is Every Test the Lab Performs Accredited?
PSLE Science Reality Lab: learn why ISO/IEC 17025 laboratory accreditation applies to defined scopes of testing and calibration, and why an accreditation logo does not make every activity accredited or every result infallible.
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PSLE Science Reality Lab Vol No.337 | “Magnitude 7 Earthquake” — Is It Just Seven Times a Magnitude 1?
PSLE Science Reality Lab: learn why earthquake magnitude is logarithmic rather than a linear multiplier, and why one event magnitude must be kept separate from the shaking intensity experienced at a particular place.
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PSLE Science Reality Lab Vol No.336 | “HEPA: 99.97% at 0.3 µm” — Is 0.3 µm the Smallest Particle It Can Catch?
PSLE Science Reality Lab: learn why the famous HEPA 99.97% at 0.3 µm figure describes a defined filter test point, not a smallest particle size, and why whole-device performance still depends on airflow, leakage and use conditions.
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PSLE Science Reality Lab Vol No.335 | “This Satellite Image Is Bright Red” — Is the Forest Really Red?
PSLE Science Reality Lab: learn how false-colour satellite images map measured wavelength bands into display colours, so a red forest can be scientifically meaningful without literally being red to the eye.
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PSLE Science Reality Lab Vol No.334 | “UL Listed” — Does That Mean the Product Can Never Fail or Be Unsafe?
PSLE Science Reality Lab: learn how to read a UL Listed or Certified mark as evidence of conformity to specified certification requirements, not a guarantee that every product can never fail under every condition.
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PSLE Science Reality Lab Vol No.333 | “This Paper Has a Correction” — Does That Mean the Whole Study Is Invalid?
PSLE Science Reality Lab: learn how to read a scientific correction notice by checking exactly what changed, whether the conclusions changed, and how a correction differs from a retraction.
