Nature
Why Leaves Arrange Themselves Around a Stem
Why leaves arrange themselves around a stem: learn to identify alternate, opposite and whorled patterns by tracing…
The reading shelf
All explanations
Browse explanations that begin with a small question and follow the clues into a larger subject.
Objects
Glass or Ceramic Water Carafe: Which Suits Your Table?
Compare a glass or ceramic water carafe by visibility, weight, cleaning and serving feel to choose the one that fits…
Ideas
The Word ‘Average’ Has More Than One Meaning
The average can mean mean, median or mode. Learn how each summarises a set of numbers and choose the measure that…
Places
Contour Lines: A Hill Drawn in Rings
Learn to read contour lines on a map: use intervals, spacing and bends to identify elevation, steep ground, valleys…
History
Before the Zipper, Clothes Fastened with Hooks and Eyes
Before the zipper, hooks and eyes closed garments point by point. See how their separate catches worked and what the…