CLEAN : Mexicans protest demanding justice over murder of three siblings

The video tutorial covers various topics, starting with an introduction to Elantra, followed by discussions on Tessa and Eureka. It then analyzes Ravi Mucha and Tristeza, examines the separation of Qantas and Columbus, and concludes with a discussion on national secrets and USC.

What is the relationship between Qantas and Columbus as mentioned in the text?

What does the term 'national secrets' refer to in the context of the text?