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Table of Contents

Unit.1 The Moai
Unit.2 Standing on One Leg
Unit.3 People in Desert Countries
Unit.4 Copernicus and Galileo
Unit.5 Stars
Unit.6 The Black Widow
Unit.7 Helpful Spiders
Unit.8 Dinosaurs
Unit.9 Dinosaurs vs Mammals
Unit.10 The First Light Bulb
Unit.11 The Wright Brothers
Unit.12 Smartphones