NASA Kids Club fun interactive games and more.
The STEM Laboratory has great project ideas for preschool, kindergarten, first grade, and second graders.
123Homeschool4Me 18 Solar System Projects
Fun at Home With Kids make elephant toothpaste
Fun-A-Day 14 Engineering Projects
Free Home School Deals 100 Engineering Projects
Project BudBurst is a Citizen Science project where tens of thousand of kids and adults of all ages participate each year in a project to track the leafing, flowering and fruiting phases of plants. The site walks you through how to collect and log your data. This is a great opportunity to start learning about ecological sciences.
Solar System Exploration Research Virtual Institute is a Citizen Science project where you can download a free app from NASA and conduct detail explorations of the lunar surface the the moon. Available data includes slope maps, rock and hazard maps, gravity maps, mineralogy maps, and imagery from Apollo missions.
NASA Citizen Science projects that include helping astronomers search other galaxies for discs of dust of debris looking for other solar systems, collect cloud data for scientists, assist scientists in studying Mars, and many more projects.
Scientific American provides lots of Citizen Science projects.
National Geographic also provides a listing of some fun Citizen Science projects.
National Wildlife Federation has information on Citizen Science projects with butterflies, birds, frogs, and more.
Left Brain Craft Brain projects for STEM, Art, Build, Food, Games, Music, Nature, and Sensory
Little Bins for Little Hands 20 LEGO projects
Steam Powered Family a fun activity to learn about electric circuits. (not for small children without parental guidance.)
Around the Kampfire writing project to learn about science
Learning at the Primary Pond writing projects for K – 2
What Do We Do All Day how to write a journal
What Do We Do All Day science activities for kids
Erintegration how to create a digital book using Google Slide
Kids Science Challenge – 40 fun science projects
PBS Kids – tons of projects, videos in the following categories: electricity, force/energy, green, health, simple machines, sound/music, space/transportation, sports/games, structures, and technology/materials.