Answer:The first constructed in 1961, the wall was the Cold War's most tangible symbol of communism and demarcation of the Iron Curtain. ... Professor Harrison: The wall symbolized the lack of freedom under communism. It symbolized the Cold War and divide between the communist Soviet bloc and the western democratic, capitalist bloc.
The answer is one mystery that still remains unsolved is why we yawn. and another theory is that when you yawn it sends oxygen to the brain causing your body to be able to stay awake, hence when you are tired and need to stay awake you yawn a lot.
