We know that we need to reduce, reuse an recycle. As teachers, we can demonstrate this important lesson by turning garbage into learning materials and lessons. Egg cartons are one of my favorite items to reuse in the classroom. The possibilities are endless. Here are over 10 ways that you can incorporate this concept into your curriculum and lessons using old egg cartons. You'll save money and be a friend to the environment as well. 10 Science Lessons Using Recycled Egg Cartons