For every good deed we did for family members that month, we got to put a piece of straw-colored yarn into the manger in preparation for Jesus' birth. Along with the nativity scene, we had a small mailbox where we placed thoughtful notes that we had written during the day to each other. At dinner, someone distributed the mail and we all enjoyed feeling loved. Let's think about the uses of salt. Maybe we're supposed to keep the world from being an unsavory place by bringing good and tasteful things into the world.
Salt preserves things, like meat.
Maybe we, by following Jesus ourselves, are helping to preserve the world. This might have to do with our example and our righteous influence. The righteous people in Zarahemla postponed the destruction of that city. Or it might have to do with our genealogy work. Without genealogy, the whole earth would be utterly wasted at Christ's second coming.