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Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.

In this science fair project you will make a model of a cell membrane using very simple material.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

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.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

This science fair project will help students learn about non-vascular plants, such as mosses.

This science fair project idea explores substances that cause a bubble to last longer.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Certain fruits can change gelatinâs ability to set. In this experiment, kids will discover what happens when gelatin meets pineapple enzyme.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

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

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

Plants and light seem to be good buddies, but how far does the friendship really go?

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

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.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

Science fair project that demonstrates the effect of detergent pollution on fresh water birds' ability to stay afloat.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

Which music genres have the fastest tempos? The slowest? This experiment determines if there's a relationship between beats per minute in a song and its genre.

This project determines what category of person is most likely to be ticklish.

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?