I'll be watching this thread as I have the same question. We will be homeschooling DS8(gr3) and DD5(grK). I was searching the internet yesterday about this but didn't come up with a desirable science "curriculum".

What I think we'll do is get a "curriculum" for Math and ELA, but for science and other subjects, just have a combination of books, videos and activities, and let the kids learn. We'll worry about formal course requirements/expectations at high school level.