Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

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.

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

Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.

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

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.

The objective of this science fair project it to determine whether adding ethanol alcohol to gasoline slows the run time of a motor.

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.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

Will male or female hair grow faster? Find out in this science fair project idea!

How do search engines work? What makes various search engines different? This project delves into the world of web crawlers, caching, indexing and algorithms.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

Discover if soda geysers will erupt when using regular vs. diet cola and which candies will create eruptions.

Assess physical and mental states of subject before and after drinking coffee. Compare initial expectations with their reported conditions.

Test out various brands of permanent markers to see which one is least water soluble.

Discover whether ants are more attracted to natural cane sugar or artificial sweeteners.

Free science fair project idea that examines air pollution in local environments. Particles are trapped by petroleum jelly on microscope slides.

Science fair project that tests how heat affects the chemical reaction between a seltzer tablet and a glass of water.

Science fair project that determines the relationship between the temperature and the rate of cricket chirping. How many times do crickets chirp each minute?