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from Education.com

Bouncing Ball Physics: What is Elasticity?

Ball bounce -- simple science fair project, good for 4th grade. How does the height a ball is dropped from affect how high it bounces.

from Education.com

How to Make a Simple Electric Motor

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from overstock.com

More Simple Science Fair Projects: Grades 3-5 (Hardcover)

from Scouts Honor Wiki

WOW Wonders of Water (Brownie Journey)

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from Planning Playtime

How to Grow Crystal Geodes

How to grow Crystal Geodes with 4 kitchen ingredients. This project is simple, stunning, and perfect for the science fair or a boring summer afternoon.

from BBC

Potato power: the spuds that could light the world

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from Buzzle

8th Grade Science Fair Projects That are Simple Yet Illuminating