Category: Science
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PSLE Science Reality Lab Vol No.234 | “Potentially Hazardous Asteroid” — Does That Mean It Is Going to Hit Earth?
A Primary 5/6 PSLE Science Reality Lab guide to the phrase “potentially hazardous asteroid”: learn why it is a monitoring classification based on orbit and size criteria, not a prediction that an asteroid will hit Earth.
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PSLE Science Reality Lab Vol No.233 | “Carbon Neutral” — Does That Mean Zero Greenhouse-Gas Emissions?
A Primary 5/6 PSLE Science Reality Lab guide to carbon-neutral claims: learn why carbon neutrality is a quantified balance involving a stated boundary, reductions, removals and sometimes offsets—not proof that zero greenhouse-gas emissions occurred.
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PSLE Science Reality Lab Vol No.232 | “Population Index = 120” — Were 120 Animals Counted?
A Primary 5/6 PSLE Science Reality Lab guide to wildlife population indices: learn why an index value such as 120 can track relative abundance without being a direct count of 120 animals.
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PSLE Science Reality Lab Vol No.231 | “MTBF = 100,000 h” — Will This Device Last 100,000 Hours?
A Primary 5/6 PSLE Science Reality Lab guide to MTBF reliability claims: learn why a mean time between failures is a statistical reliability quantity, not a countdown or guaranteed lifetime for one device.
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PSLE Science Reality Lab Vol No.230 | “Germination = 90%” — Will Exactly 9 of Every 10 Seeds Grow?
A Primary 5/6 PSLE Science Reality Lab guide to seed-packet germination percentages: learn why 90% is a result from a defined sample test under stated conditions, not a guarantee that exactly 9 of every 10 seeds in every packet or planting will germinate.
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PSLE Science Reality Lab Vol No.229 | “Pasteurized” — Does That Mean the Milk Is Sterile?
A Primary 5/6 PSLE Science Reality Lab guide to the word “pasteurized”: learn why a validated heat treatment that controls harmful germs is not the same scientific claim as sterile, germ-free or automatically shelf-stable.
