The "Separable Fastener", now called a zipper, was patented by Gideon Sundback in 1913. When I say patented, that means that he registered it with the government, and even though there were other versions on the zipper before that, he gets credit for inventing it. At first it was only used on shoes but the military made it more popular when they started to use a zipper on flying suits.
The reason that zippers are so popular is because they are so strong to pull things together. Stronger than clasps, buttons, hooks, and even velcro, the metal zipper is considered the strongest!
Well, can we think of what God says will pull Christians together in unity? Look at Colossians 3:14. It says, "And above all these put on love, which binds everything together in perfect harmony." (ESV) What does that mean? It means if we have love for each other, we will be stronger together. We can face hard times, and good times together because we are "zipped" together by Christian love.
Here's a project for you today: Count how many zippers there are on the things that belong to you. Don't forget the zippers on your jeans and the zippers on your boots. And when you're done, thank God for the strong bond of love that He gives us through love.