Lesson 1 has two parts:

PART 1

PART 2

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Lesson 2:

PART 1

PART 2

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Lesson 3:

PART 1

PART 2

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Lesson 4:

PART 1:

PART 2:

PART 3 (Research Paper 1 discussion) - The only way for the moment is to download the file mp4 from here: 

https://drive.google.com/drive/folders/1Fkp4am5gSxRyy2pYYvrcEK8mfdQeUeoa?usp=sharing