What are some of the must-see Youtube videos?

Preview

1. https://www.youtube.com/watch?v=Yr-Zz5HbO7Q&list=PLwGzY25TNHPAtgsHJ6CnH-pn38anqOwzH

To get the Soviet perspective of World War II or Great Patriotic War as they call it.

2. https://www.youtube.com/watch?v=ZLC2yiuxcqQ

How to get more productive doing deep works.

3. https://www.youtube.com/watch?v=xDFvwHTzG1c