Exploding bags with baking soda and vinegar-science lesson. They take off like rockets!
Silky soft play dough for kids using 2 ingredients1 cup conditioner (cheaper the better) 2 cups cornflour/cornstarch Glitter (optional)
A fun craft for kids to personalize their gardens. Rocks, outdoor glue and paint create these one of a kind garden rock caterpillars.
Explore the 5 Senses with Kids Painting with Tea Bags
fun way to teach time
Make ice play and water play beautiful with this gorgeous activity for kids! Freeze flowers and let kids explore them as the ice melts. - Crafts on Sea
Natural Nature Play Dough
This simple outdoor activity will entertain kids all summer long! Painting with water is so much fun, it's easy to set-up, and it's mess free! - Happy Hooligans
Great idea for a jungle small world made with play dough

More ideas
.So easy, so fun, so many possibilities for discovery and learning
Great idea for a jungle small world made with play dough
Science Project-Glowy EggLet Sit the Egg into plain white vinegar for few ours and it turns out this
The Magic Ketchup Experiment! Kid friendly site with lots of neat experiments!
DIY moving science experiment
25 AMAZING Easter science experiments that will blow your kids mind
Rock Candy.  1 cup water, 2-3 cups sugar, tall narrow glass jar, clothes peg and a skewer, food colouring (optional).  Heat water and dissolve sugar until no more will dissolve, roll skewer in extra sugar, let cool then put in water.  2-3 days and you will have rock candy.
Newton's First:  with raw eggs.  Pinner said: "ok, this is cool! Our family just tried it. I wish I had, had a camera for my husband's face when I knocked the pie pan! lol The kids think this is SO cool!"
Cool trick! Yellow water in one cup, blue in another, empty cup in middle. Put a paper towel into each the blue & yellow cup and the water will drain making green!