We are using sea to shining sea for history, and apologia physical science this year. I have to say that Sea to Shining Sea is amazing. It reads so beautifully, the illustrations are bright, and DS really enjoys reading it. I do have a concern over the young earth issue, but is not as prevalent as I thought it would be; perhaps it becomes different in high school? I did discuss this with my DS, but right now Apologia looks like the best option for science. Does anyone have ideas for Catholic biology?