Science Mysteries
Pick a mystery. Have a guess before you peek — that guess is the whole point.
Density & Floating
PhysicsWhether something floats depends on density — and you can come at that one idea from four different directions.
- 1
Why does ice float?
Tier 2 · water
- 2
Why does a giant steel ship float when a tiny coin sinks?
Tier 2 · water / forces / density
- 3
Why does a huge, heavy hot-air balloon rise into the sky?
Tier 2–3 · air / forces / density
- 4
Why do you float more easily in the sea than in a swimming pool?
Tier 2 · water / forces / density
Light & Colour
PhysicsLight travels in straight lines until it meets something — then it scatters, bends or splits, and that is where colour comes from.
States of Matter
ChemistryMatter moves between solid, liquid and gas as energy is added or taken away — and gases can even hide dissolved inside liquids.
How Your Body Works
The Human BodyYour body is constantly adjusting itself to stay balanced — and many of the odd things it does are automatic self-regulation you never decide to do.
Day, Night & Seasons
Earth & SpaceEarth's spin and its tilt — not how close we are to the Sun — create day, night and the changing seasons.
Meet the Microbes
MicrobiologyThe world is full of invisible living things — most harmless or helpful, a few harmful — and understanding them keeps us healthy and even feeds us.
More clusters are on the way — light & colour, states of matter, the human body, and beyond.