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เนื้อหาย่อ : Contents VARIATION pages 1-52 Variation in Properties pages 3-20 Butterflies and Bolts / Rocks and Shells / Reducing Variation in a Set / Recording Variation / Make a Histogram / Many Kinds of Seeds / Put It in Order / The Range of Variation / Potato Variation /Cookies or Crackers?/ Hidden Variations Variation in Interaction pages 21-30 Collision Systems / Sports Systems / Chemical Systems / Musical Variation / A Pendulum Timer / Timing Interactions / Racing Against Time / Fast Interactions Estimating and Predicting pages 31-52 How Many Grains? / How Many Stars? / Making Estimates / Big Potato, Little Potato / Estimating Sizes / Describing From Samples / Estimating Time / The Time Machine / Predictions/ | Predict. / Constantly Changing / Predicting the Weather PLACE AND MOTION pages 53-104 Position pages 55-78 Lost and Found / Locate the Object / Choosing Reference Objects / Distance / Paper Position Systems / Game: Four-Straight / A Direction System / Making a Position Finder / Position Patterns / Pattern Art / Finding Like Patterns/ Interaction Patterns Motion pages 79-104 Something Moved / Steps in Motion / Here to There / Making Flip Books / Ideas for Flip Books /