- 第1 部分 ： Lesson 1-3 - Moon Phases
- 课时1：Lesson 1-3 - Moon Phases Preview
- 课时2：Lesson 1 - Science Background：Observing the Moon 11:09
- 课时3：Lesson 2 - Science Experiment：Think Like a Scientist 13:10
- 课时4：Lesson 3 - Science Connections：Phases of the Moon 10:44
- 第2 部分 ： Lesson 4-6 - Plant Growth
- 课时5：Lesson 4-6 - Plant Growth Preview
- 课时6：Lesson 4 - Science Background：What Are Plants? 08:16
- 课时7：Lesson 5 - Science Experiment：Think Like a Scientist 06:09
- 课时8：Lesson 6 - Science Connections 17:16
- 第3 部分 ： Lesson 7-9 Water Cycle
- 课时9：Lesson 7-9 Water Cycle Preview
- 课时10：Lesson 7 - Science Background：Water Everywhere 12:55
- 课时11：Lesson 8 - Science Experiment：Think Like a Scientist 10:54
- 课时12：Lesson 9 - Science Connections: The Water Cycle 16:45
- 第4 部分 ： Lesson 10-12 Volcanic Eruption
- 课时13：Lesson 10-12 Volcanic Eruption Preview
- 课时14：Lesson 10 - Science Background 18:36
- 课时15：Lesson 11 - Science Experiment：Think Like a Scientist 10:48
- 课时16：Lesson 12 - Science Connections: Volcanic Eruption 07:29
- 第5 部分 ： Lesson 13-15 Food Chain
- 课时17：Lesson 13-15 Food Chain Preview
- 课时18：Lesson 13 - Science Background：What Is a Food Chain？ 09:03
- 课时19：Lesson 14 - Science Experiment：Think Like a Scientist 11:27
- 课时20：Lesson 15 - Science Connections: Bigger Food Chain 10:59
- 第6 部分 ： Lesson 16-18 Landforms
- 课时21：Lesson 16-18 Landforms Preview
- 课时22：Lesson 16 - Science Background 18:24
- 课时23：Lesson 17 - Science Experiment：Think Like a Scientist 11:07
- 课时24：Lesson 18 - Science Connections: Nature Takes Its Time 06:26
- 第7 部分 ： Lesson 19-21 Forces and Motion
- 课时25：Lesson 19-21 Forces and Motion Preview
- 课时26：Lesson 19 - Science Background：What Is a Force？ 07:54
- 课时27：Lesson 20 - Science Experiment：Think Like a Scientist 14:01
- 课时28：Lesson 21 - Science Connections: Forces Everywhere 11:59
- 第8 部分 ： Lesson 22-24 Animal Camouflage
- 课时29：Lesson 22-24 Animal Camouflage Preview
- 课时30：Lesson 22 - Science Background：Animals Try to Hide 03:23
- 课时31：Lesson 23 - Science Experiment：Think Like a Scientist 05:32
- 课时32：Lesson 24 - Science Connections 26:01
- 第9 部分 ： Lesson 25-27 Magnet
- 课时33：Lesson 25-27 Magnet Preview
- 课时34：Lesson 25 - Science Background 22:08
- 课时35：Lesson 26 - Science Experiment：Think Like a Scientist 05:55
- 课时36：Lesson 27 - Science Connections: Can Electricity Make a Magnet？ 04:56
- 第10 部分 ： Lesson 28-30 Pulse Rate
- 课时37：Lesson 28-30 Pulse Rate Preview
- 课时38：Lesson 28 - Science Background：Your Heart Is a Pump 15:23
- 课时39：Lesson 29 - Science Experiment：Think Like a Scientist 09:32
- 课时40：Lesson 30 - Science Connections：Heart Rate Rises 05:32
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