Curated OER
Child Adolescent Sexual Development: Infant and Preschool
This is a very comprehensive lesson on infant and preschool sexual development. It says only one class period, but I think it could be several days worth of materials to cover. The point of view taken here is from that of being a parent....
Exploratorium
Exploratorium: Science Explorer: An Exploratorium at Home Book
Over 30 simple, interactive, experiments can be found on the Exploratorium site. This museum, based out of San Francisco, presents each experiment with a list of materials, a short procedure, and the scientific reasoning behind the...
Other
Science at Home: The World of Matter
Science at Home offers this site full of simple experiments that can be conducted at home. Don't miss the other sections, "forces and energy" and "electrons in action".
Discovery Education
Discovery Education: Exploring Nature
This article gives some excellent ways we can engage our children in exploring and learning about nature.
US Department of Education
U.s. Department of Education: Science in the Home Activities
You don't need to be a science teacher in order to teach science at home! This site has a great list of activities along with everything you will need to conduct them.