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

This science fair project idea is develops new or improved paper making techniques and encourages recycling.

In this experiment, recycled objects are separated to demonstrate how mixtures are made and the variance in the physical properties of their ingredients.

This science fair project idea discovers new ways to use recycled materials and encourages new architectural design ideas.

This science fair project idea's objective is to become familiar with items your family regularly throws in the trash.

This science fair project idea observes products available in the school cafeteria and waste produced by these products.

In this experiment, the weight of aluminum cans will be compared.

Make a periscope with milk cartons and mirrors! This preschool activity is great for playing secret agent and learning simple physics.

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

The aim of this science fair project is to examine the differences between brands of bottled water and analyze consumer preferences through a taste test.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Science fair project that compares the ecology of different soil samples by identifying which sample has the most invertebrates living in it.

Find out which kind of bubble wrap fares best when put in impact.

What is a series circuit and how does it work? Learn about voltage, electrical current, and resistors in this cool science experiment!

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

Here's a science activity to help your child investigate how seeds are designed to travel.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Discover whether a metal will expand under hot water.

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.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

Find out whether matching resonant frequencies can cause objects to shatter.

Explore the belief in astrology as a predictive system.

Learn about our response to scents that existed in our environment over evolutionary time and consider why scents might affect our mood state.

This project uses science and art to help students learn and teach others about Earth's endangered and extinct species.

Find out whether putting something on top of a plant will inhibit its growth.

Do suds equal more clean or does a sud-free cleaning agent works just as well or even better?

Do different types of oil mix or stack? Find out in this science fair project idea!

Compare air temperature with the infrared temperature from a reflecting surface at different times of the day, in shade and in sunlight.