Investigating autumn leaves on the light panel
Color changing flowers - amazingly fun Science for kids! (preschool or kindergarten)
P is for pendulum - learning about pendulums in preschool...great summer camp project idea too!
Not my idea but a wonderful Tuff Spot activity
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Sound marble run
Are Seeds the Same Science Investigation
Look at this great idea for making your own "Potions Cupboard"
Natural items on display to encourage use of senses.