NSTA Press publishes huge numbers of science related books. All are designed for teachers, but many would be useful for homeschoolers. My favorites that I’ve seen recently are Even More Everyday Science Mysteries by Richard Konicek-Moran and Outdoor Science by Steve Rich.
I’d skip right over the “Correlation to National Science Education Standards” – unless you find yourself in a situation where you need to justify your homeschool plan to someone – and go straight to the fun sounding projects! Both books are written to use with a wide range of ages so are perfect for families or homeschool groups.
Examples of projects from Outdoor Science include building simple machines, planting an historical herb garden, and investigating how humans use fences. Science Mysteries uses short stories to get the student thinking about what could be happening to cause the mysterious situation and then includes related activities and references to find the real answers. Lots more information about books and science at their web site at http://www.nsta.org
Outdoor Science: A Practical Guide by Steve Rich
Even More Everyday Science Mysteries by Richard Konicek-Moran