Category: PSLE Primary Science
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PSLE Science Reality Lab Vol No.486 | “MPN = 100 per 100 mL” — Were Exactly 100 Microorganisms Counted?
A Primary 5/6 evidence guide to Most Probable Number: how positive/negative test patterns produce a statistical concentration estimate rather than an exact direct microorganism count.
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PSLE Science Reality Lab Vol No.489 | “Data Updated Today” — Were the Measurements Collected Today?
A massive Primary 5/6 PSLE Science Reality Lab guide to scientific data dates: learn why “updated today” can describe database, processing or publication activity rather than when the underlying measurements were collected.
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PSLE Science Reality Lab Vol No.485 | “Extent of Occurrence = 10,000 km²” — Does the Species Occupy Every Point Inside That Boundary?
A Primary 5/6 evidence guide to reading IUCN Extent of Occurrence as a measure of geographic spread, not continuous species occupancy throughout a polygon.
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PSLE Science Reality Lab Vol No.484 | “Rainfall = T (Trace)” — Does That Mean No Rain Fell?
A Primary 5/6 evidence guide to reading trace precipitation correctly: T means precipitation occurred below the reporting system’s measurable amount, not exactly zero.
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PSLE Science Reality Lab Vol No.488 | “Dashed Fault Line” — Does a Broken Line Mean the Fault Stops or Is Not Real?
A massive Primary 5/6 PSLE Science Reality Lab guide to fault-map symbols: learn why dashed, dotted or queried traces can communicate approximate, inferred or concealed locations rather than a fault disappearing, and why the legend controls the meaning.
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PSLE Science Reality Lab Vol No.483 | “IP67” — Does That Mean a Device Is Waterproof at Any Depth for Any Length of Time?
A Primary 5/6 evidence guide to reading IP67 as a defined ingress-protection classification rather than an unlimited waterproofing promise.
