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Do You Know
T. Wall & Sons - 1965

Notes:  Cards are approximately 1-3/8" x 2-5/8", and feature full-colour artwork
on fronts and descriptions on card backs.  Thanks to Kyle DeRoy for the original
checklist!

No.   Title

  1   How far away the Horizon is?
  2   Why the Glutton is So-called?
  3   What a Boomerang is?
  4   Why we sometimes become Giddy in High Places?
  5   The Cause of Fairy Rings?
  6   Why Coins have Milled Edges?
  7   Why Telegraph Wires Hum?
  8   What Causes a Whirlpool?
  9   What is the Peace Pipe?
 10   What is a Praying Mantis?
 11   How an Aircraft stays in the Air?
 12   Which is the Biggest Tree in the World?
 13   What Causes the Waves?
 14   What Causes the Wind?
 15   Why the Stamp is stuck at the top right-hand corner of the Envelope?
 16   Why the Flying-Fish Flies?
 17   What Causes the Colours of the Sunset?
 18   What is a Globe Fish?
 19   About the Great Wall of China?
 20   Why Oil Calms Rough Water?
 21   What Causes Knots and Grains in Wood?
 22   How the Nettle Stings?
 23   Why Natives of Hot Countries are Black?
 24   What Causes a Volcanic Eruption?