Not so?

The language here continues to intrigue me. A common expression here is "not so?". It is basically asking someone if they agree with you, but it appears at the end of almost every sentence. For example: Canada is a wonderful country. Not so?
Tonight we taught the teachers how to use the computers. Most of them have never touched one in their lives. We decided to start them on google and let them search for a topic of their choice. Most of them started typing sentences in the search bar so we switched them over to Microsoft Word and let them type away to their hearts content. They loved it. At one point the electricity went out. When it came back on one person was shocked to see the wallpaper picture of fish on their screen. They yelled, "come quick and get these fish off the screen, I want to type!" It was priceless.
Last night's Canada night went well. We played hockey with mini sticks, played Canadian Trivia and watched a slide show of pictures of Canada. We drank some Star beer and soft drinks and danced the night away. (okay so we ended at 9pm but that's late around here, since morning prayer starts at 5am and is broadcast over a loud speaker)