In honor of two friends who once bought me groceries for Christmas when I was scared and broke, and wrapped each package by hand to make me feel special, I'm issuing a Winter Holiday Challenge: Do at least one Random Act of Kindness before the year's end. It doesn't have to be monetary: Give someone a ride. Shovel a sidewalk. If you do have money, though -- consider doing something like this. It's been a tough year all around, so share some love.