Does anyone know of a secular book or curriculum for 2nd grade science? This last year we mostly used an unschooler method for science since almost everything can be broken down in such a way. My son could ask something about the moon and he'd end up getting an involved lesson on gravity, or light rays and reflection, etc. I have Building Foundations for Scientific Understanding and I love it (I've learned so much!), but it's a real pain preparing for each lesson.