Here is a terrific science curriculum for elementary-aged children. The life science course is FREE to download. It covers everything from biomes, life cycles, senses to body organs, classifications and health. It is written in a very engaging format and my kids have really enjoyed the course. I download and print out the pages and put them into a binder so it makes a handy science textbook. Whether you homeschool or not, this curriculum as well as the paid science courses are well worth the time.