Do human lie detectors exist? Charge up your powers of observation to see if you can tell a lie from the truth.

The goal of this middle school science fair project is to examine the effect of caffeine on plant growth.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

Evaluate the ability of a biodegradable dish detergent to increase the penetration of water in hydrophobic soils.

This science fair project explores different types of endangered frogs, and why some are endangered while others are not.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

In this cool science experiment, test and compare the adhesive holding strength of homemade casein glue versus commercial glue.

Science fair project that compares leaf pigments of various tree species. Which tree species do you think will have the most pigments and why?

The project compares three different methods of testing turbidity in water: the secchi disk, spectrophotometer, and turbidity test kit.

The purpose of this science fair project is to learn which substance best preserves apples. Learn about enzyme interactions in fruit and scientific processes.

What do worms eat? Kids find out what kinds of rotting leaves and vegetables worms prefer in this cool compost science fair project.

In this cool psychology experiment, study how companies air commercials to strategically advertise to viewers who will buy their products.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

The objective of this science fair project is to determine whether there are gender differences when boys and girls view optical illusions.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

This science fair project idea enhances awareness of local food production and food sourcing.

This optics-based science fair project idea teaches kids about real and virtual images with a mind-bending candle illusion inspired by Pepper's Ghost.

Science fair project that examines learn how the angle of incidence affects the efficiency of solar panels. How does a solar cell work?

This project examines the vulnerability of fruit flies, Drosophila melanigaster, to irradiation. Will exposure result in mutations?

Check out this fun middle school science fair project idea on Newton's third law of motion and how you can change the speed of a rocket.

This science fair project teaches students about wilting and browning of salad greens.

This cool and easy elementary school science fair project idea provides the basic information on the use of our senses to experience the world about us.

The objective of this science project is to determine whether the brain first processes colors, shapes, or words when given conflicting messages.

This experiment determines the distribution of darts around a bulls eye to simulate the probability of an electron's location in its own cloud of electrons.

In this project, sunlight is blocked from a leaf in order to see the affect that sunlight has on leaves.

This experiment investigates whether the primacy effect is observed more frequently in specific populations of people.

In this science fair project, we'll explore how blocking the sun's light can stop those can stop photosensitive paper from changing color.