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Ice volcanoes are easy to make and a fun science and play activity for kids of any age.

Ice Volcanoes ~ Reading Confetti

Moon Sand Experiment with Absorption: Great Science experiment to understand how the sensory dough works

9 awesome ideas for making eruptions with kids!

How to Make Lightning - Two simple science experiments for kids to demonstrate how to make sparks and explain how lightning occurs.

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!"

All for the Boys - balancing act toy made from cardboard

Again, easily extended for older children by adding two ramps so that comparisons can be made, applying cloth to the surface, then vaseline, to see how those affect rolling speed, etc.

Simple science for kids - Hands on water experiments to explore liquid, solid and gas.

Two different styles of weighing scales that kids can make out of easily found materials- creating the scales is just as fun as finding things to compare!

A giant list of super fun science experiments to do with kids with simple household items.

Scientific American features a fun, new, science-related activity every Thursday that parents and their six- to 12-year-olds can do together. Adults will find easy-to-follow instructions and simple materials lists as well as additional background to help them explain the key concepts.

hundreds of cool science experiments.

Experiments for kids - 4 FUN experiments that explore liquids, colors, reactions, and more! - Science Camp!

@Lynn Thompson While this is a Cub Scout project . . . I've used it with a variety of children. It's construction, launching mechanics, prediction and fun rolled into one gadget!

Marshmallow Shooters - The easiest way to have fun with the family. All you need are styrofoam cups, balloons, and marshmallows!

All 100 episodes of Bill Nye the Science Guy...