01 Amazing Flowers 02 Cactus in the Desert 03 The Migration of Birds 04 Fruits and Vegetables 05 Review (Lessons 1?4) 06 How Plants Get Water 07 Dandelions 08 Fossils. 09 Where to Find Fossils 10 Review (Lessons 6?9) 11 How Old Are Fossils? 12 The Air We Breathe 13 Fizzy Soda 14 Wind 15 Review (Lessons 11?14) 16 How Do Birds Fly? 17 The Heat of the Sun 18 Refracting Lit19 Movie Projectors 20 Review (Lessons 16?19). 21 Adapting to Survive 22 Comig for Resources. Weather Forecasts 24 World Climates 25 Review (Lessons 21?24). 26 Life on the Tundra 27 Mirrors 28 Location 29 Energy and Motion 30 Review (Lessons 26?29) 31 Lightning. 32 Sound. 33 Minerals 34 Igneous Rocks 35 Review (Lessons 31?34) 36 El Nino. 37 Batteries 38 Caves 39 Elements and Atoms. 40 Review (Lessons 36?39) 41 Mercury. 42 The Common Raven 43 The Piranha 44 The American Alligator 45 Review (Lessons 41?44) 46 Meteors and Meteorites 47 The Cheetah 48 The Great White Shark 49 The Red Panda 50 Review (Lessons 46?49)