My girls (especially my oldest) LOVE science and experimenting at home. My mom gave us a book full of science experiments to do together this year and it is one of their favorite things.
Whether you homeschool or not, This saline solution slime is perfect for kids as a science and sensory play activity.
I get stressed out easily when my kids are making a mess in my kitchen (which happens often, haha!) But this is pretty contained in one big bowl (and as you can see, you can bring the fun outside too).