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Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

Research Earthship buildings. Draft a unique architectural design that repurposes used, discarded radial tires. Build scale model of structure.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

Science fair project that tests whether cats have a preference for organic food.

Measure the porosity of rocks by submerging them in water. Measure how much water each rock "drank," by measuring the difference in water volume.

Science fair project that cultivates slime mold and monitors the stages of its development.

This project explores what happens to a rubber band when it is heated and cooled.

Science fair project that compares the properties of different fabrics to determine whether natural or synthetic fabrics are better at wicking away moisture.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

In this science fair experiment about recycling, demonstrate how the wax from a candle can be reused to make another candle.

Find out the differences (if any) in the frequencies of voices produced from a computer, from a phone, and directly coming out of the voice box of a human.

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

In this experiment you will use plastic and magnets to test your local soil composition.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Is horse manure a possible energy source in a crisis? Use calorimetry to find out how much energy horse manure can produce in this science fair project.

Wiggly worms are known for staying buried in the soil, but how does that affect plants? Are earthworms and plant growth related?

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

The purpose of this science project is to determine which stimulus, gravity or water, will cause the greatest growth response in a plant.

Determine whether carpet placed on a lawn will kill grass and weeds. Choose an area of lawn that you would like to remove, record grass that is dead or dying.

Research information on vitamin content in foods, Examine the effect of vitamins, test organic samples of fruits, meats, grains for vitamin content.

The objective of this science fair project is the compare the rate and efficiency of disaccharide and polysaccharide fermentation by yeast.

This science fair project idea explores which kinds of earplugs are the most effective.

Evaluate whether people can raise the temperature of their finger using the power of their thoughts.

Find out which type of sponge holds the most water.

This science fair project idea determines whether land or water warms more quickly and investigates how solar radiation increases the temperature of surfaces.

Kids will make a homemade electroscope and explain how it detects static charges through induction in this fun science fair project idea.

More height, more steep, more speed! This science project investigates whether there is a correlation between the height of the roller coaster and the slope.

The objective of this experiment is to find out if cooked beans grow faster, if at all, than uncooked beans.

Science fair project that explores the natural process of limestone formation.