The Berlin Wall splintered a city and divided a country, but it may also have prevented nuclear war. Why block off a city with concrete, barbed wire and land mines?
As we look back on 2011, it's clear it was a banner year. Well, maybe not for the housing market, but at least got to watch a Royal wedding and dispell rumors about the McLobster. Now it's time to put your memory to the test. How much do you really remember about 2011? (Image credit: Swinburne Astronomy Productions.) See more »