The Greatest Tracks

What is the 'black box' on board, and how does it work? After all, what is the 'black box' on the plane? Why is it necessary to search for a plane crash? No matter how big a plane crash, why is there no damage to the 'black box'?

What is Initial Coin Offering (ICO) and how does it work? Have you heard about ICO at the moment? Why today whoever you look at wants to know about this term ICO. Friends, as we know that Cryptocurrency is trending on the internet these days.