Determine how different measurements of the same object might yield different values. Provide as many reasons that you can think of.

Research different measurement systems, design your own new or improved system that can measure something difficult to measure with traditional systems.

Boost your preschooler's attention to detail by getting her to explore the differences between two different pumpkins: large and small.

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.

Science fair project that determines how UV radiation emitted by the sun varies depending on the time of day, using a handheld UV detector

Determine how proficient you are at making estimations and learn how to make more reasonable estimates.

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

This science fair project idea deals with the qualities of shade on a sunny day.

This science fair project idea tests whether it is true that humans are in the morning than later during the day/night.

Science fair project that explains and demonstrates the parallax principle.

Plant sunflower seeds , measure height, calculate average height, compare size and weight of heads. Interpret findings in detailed report.

This fun science project helps to investigate how much water can a plant take up and release in a certain period of time through the process of transpiration.

This science fair project idea sheds some "light" on which color of candles burn the longest.

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

Demonstrate which cooking method gets rid of the most fat.

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

Measure the speed of the earth's rotation using protractors and meter sticks. This science fair project measures the angle of the sun in relation to earth.

This science project allows students to study the psychology of happiness.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

Measure the densities of various fruits and vegetables to determine if there is a relationship between density and nutritional value.

Determine whether the relationship between a personâs armspan and height are genetic.

In this project students learn about the golden ratio and investigate if it can be used to predict people's assessment of beauty in others.

Science fair project that determines which types of clouds are best at blocking harmful UV radiation.

This science fair project idea measures the growth of bread dough and finds out how long it takes for the dough to stop rising.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Science fair project that tests the effects of diluted soap on the size of bubbles blown from the solution. Will dilution cause smaller bubbles?

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

This project examines who can jump higher, boys or girls, younger people or older, and how these two factors, gender and age, interact with one another.

This experiment will explore if magnetism has any effect on the regeneration abilities of flatworms.

This science fair project idea attempts to develop a new or improved eco-friendly packing material.