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Today's lesson will focus our attention on utilizing a Dispatch Group again to help synchronize data across all of the cells in our <b>TodayController</b>. One thing I strongly recommend is to keep your service fetch calls outside of your view layer, this way all of your data is held in one single place. This single place should be the <b>TodayController</b> and we'll be fetching our data from there. Enjoy.