Category: Science
-
PSLE Science Reality Lab Vol No.246 | “One Grab Sample Met the Limit” — Does That Mean the Whole River Met It All Day?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on grab samples: why one passing water sample represents a specific place and time, not automatically an entire river or day, and how repeated, spatial and composite sampling change what a claim can support.
-
PSLE Science Reality Lab Vol No.245 | “Satellite Soil Moisture = 0.30” — Does That Describe the Soil All the Way Down to the Roots?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on satellite soil-moisture maps: why a surface soil-moisture value represents a shallow layer and area rather than the whole soil profile, how root-zone products add modelling, and how rain, depth, pixel size and time change what a map can support.
-
PSLE Science Reality Lab Vol No.244 | “Satellite Chlorophyll-a Is High Here” — Did the Satellite Count the Phytoplankton?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on ocean-colour maps: how satellites measure light, algorithms estimate near-surface chlorophyll-a, chlorophyll acts as a proxy for phytoplankton, and why a coloured map is not a direct count of microscopic organisms.
-
PSLE Science Reality Lab Vol No.243 | “Species Occupancy = 70%” — Was the Species Actually Seen at 70% of the Sites?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on wildlife occupancy claims: why estimated site occupancy is not the same as the percentage of sites where an animal was seen, how imperfect detection changes evidence, and why occupancy is not an animal count.
-
PSLE Science Reality Lab Vol No.242 | “Emission Factor = 2 kg per tonne” — Was 2 kg Actually Measured From This Exact Source?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on emission-factor claims: why a representative factor is an estimate tool rather than a direct measurement of one exact source, how activity data and control conditions change the estimate, and how to decide what an emissions statement really proves.
-
PSLE Science Reality Lab Vol No.241 | “The Concentration Halved” — Did the River Carry Half as Much Substance?
A massive PSLE Science Reality Lab guide for Primary 5/6 learners on river monitoring claims: why a lower concentration does not automatically mean a lower mass load, how streamflow changes the amount transported, and how to evaluate concentration, discharge and time together before making a scientific conclusion.
