✂️ Ready for a cool science experiment with your kids? Turn an old glass bottle into a stylish pen holder while teaching them about thermal expansion and contraction! 🔍 What you'll need: • An empty glass bottle (a soda or wine bottle works well) • Cotton string • Isopropyl alcohol • A lighter or matches • A bowl of cold water • Wet sandpaper 👀 Here’s how to do it: 1. Wrap it up: Wrap a cotton string around the bottle where you want to cut it. Make sure the string is snugly in place. 2. Soak it