Waste and our World

Wheels and Levers

Building Devices and Vehicles

Light and Shadows

Plants Growth and Changes

The Adventures of Herman the Worm Levers - Info     The Great Plant Escape
Wastes Crossword Puzzle Simple Machines   Shadows Trees Are Terrific - Travels with Pierre
  Find Simple Machines   Light Spectrum Importance of plants
  Interactive levers at Wonderville   Funhouse Mirrors  
      Shadow Puppets  
      Bending Light