Our kids LOVE Green Kid Crafts. I get both the Junior Box for my little one and the Discovery Box for my older kiddo. We've gotten a few months worth now and the kids bounce off the walls when they see the green boxes on the porch. There is so much to do in this box that we are able to make it last at least a few weeks. The themes are amazing and spot on with the age of my kids - Rocket Science, Amphibians, The Human Body, Bubble Science etc. Our last box was Weather Science and my kids are still using the Cloud Finder and Weather Station projects. My 6 year old pretty much completes all the experiments and crafts on his own, My 3 year old and I do the projects together which is fine as it really brings us together doing something fun that I don't have to design and come up with on my own.