If you run out of glue you can make your own! Milk turned into milk protein can be a very good glue!
KAI: So let’s say you’re stuck in the house for the day. Maybe it’s yucky out or you’re not feeling great. Maybe you’ve been grounded. Let’s say you’ve got a lot of paper just lying around and you really wanna make something with it. Say some kind of cool paper robot. So you start making your fantastic paper robot, but partway through, oh no, you run out of glue. Well don’t worry. If you’ve got milk, some vinegar, and some baking soda, you’ve got glue. You take half a cup of milk, add 2 tablespoons of vinegar, stir that a bit and then let it sit for a couple minutes. There’s a chemical reactions between the proteins in the milk and the acid in the vinegar that separates the milk from the curds and whey. You could even make cheese with the curds. But you don’t want cheese, you want glue. So strain off the liquid away. If you haven’t got a strainer, use a paper towel or a coffee filter. It takes about 5 minutes to drain all the way. And see? What you have left are the curds. Dump those into a bowl. Now you add 2 teaspoons of water and 1 teaspoon of baking soda to the curds. Give that a stir. You should see and hear bubbles fizzing as the baking soda reacts with the vinegar and it releases carbon dioxide. And there you have it, your own homemade glue. Milk glue. Now we have our glue, we can get back to making our robot.