CLEAN : Kharkiv metro, a bomb shelter for Ukrainians, resumes services

The video tutorial covers various topics, starting with an introduction and context setting. It then delves into a detailed discussion and analysis of key points, followed by examples and practical applications of the concepts. The tutorial concludes with a summary of the discussed topics.

What does the phrase 'Maybe it's upstream' suggest about the speaker's thought process?

Discuss the significance of the statement 'So this worked for years' in the context of persistence.