Build basic projector out of ordinary materials. Create several color transparency slides, demonstrate your creation.

Check out this fun science fair project idea to explore the process of diffusion in a cell and learn the difference between osmosis and diffusion.

Research camouflage products and techniques, test quality by timing volunteers. Calculate the average length of time to recognize the subject.

Study history of aerodynamics of arrow design to create a perfect arrow. Test arrows by shooting at an archery target.

Consult astronomers for opinions and advice. Devise a mathematical argument regarding the probability of other planets supporting extra-terrestrial life.

Demonstrate the relationship between mass, volume and density. Measure displaced water, and weigh object to calculate mass and density.

This science fair project idea examines the actual cost of three household light bulbs by testing energy consumption.

Research overview of architecural acoustics. Design and build a whispering wall from wood or plastic. Test which materials work best.

Store seeds under three different environmental conditions. Plant seeds in carefully marked groups, watch them grow. Compare results.

Research historic methods of food preservation. Analyze alternative recipes and techniques of food preservation. Document success with photographs.

Research optical illusions and human auras. Understand why the probable cause of perception is mach bands.

Design and build a scale model representing living tree architecture. Then build a full-size version using one or more lives trees, and test your creation.

This science fair project compares the abilities of men and women to understand subtle communication through body language.

Consult mechanics, automotive specialists for advice. Build a real engine or a scale model. Test and demonstrate its mechanical properties.

Study blind spots, run experiments in blind spot detection, design an original blind spot experiment, test your design on volunteers

Science fair project idea examines what is remembered from high school education. Formulate and administer high school curriculum tests to adults over 21.

Science fair project that demonstrates the principle of conservation of mass by conducting a chemical reaction inside a sealed Ziploc bag.

This project explores how well couples convey complex emotions such as envy and pride to one another solely through the sense of touch.

A great science fair project on solar oven design that helps kids learn about solar power and solar heating.

In this science fair experiment, high school students fit the growth pattern of bacteria to a mathematical model and predict future colony expansion.

Check out this fun high school science fair project idea to investigate how the cell membrane regulates what moves into and out of cells.

Research long-term effects and draft a questionnaire about frequency of marijuana use and average annual income. Interpret findings in a detailed report

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

Free science fair project idea that examines cheating in school-age children. Project involves a task in which children are tested on various tasks.

Research active ingredients in anti-aging creams. Test skin creams on volunteers, document the effectiveness of the creams with before an after photographs.

Create groups of volunteers based on frequency of playing video games. Compare driving records. Analyze data, interpret findings.

Explore the concept of receptive fields and why different parts of our body have different levels of sensitivity.

Administer IQ tests to volunteers. have one group practice typical IQ test problems. Then compare results of the two groups.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Science fair project that compares the biodiversity of fungi in different ecosystems by identifying species of fungi.