This fun science fair project idea explains what a circadian rhythm is and explores the types of biological activities that follow a 24 hour cycle in mammals.

Explore properties of liquids and how temperature and salinity effect surface tension of liquids in this fun- filled science fair project idea.

This science fair project idea quantifies exactly how accurate the cricket thermometer is.

Give your second grader a chance to get his feet wet with measurement before he moves onto the more complicated stuff by trying this activity with him at home.

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?

The objective of this science experiment is to evaluate the affects of high and low heat capacity on a material's heat retention ability.

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.

This science fair project idea determines whether land or water warms more quickly and investigates how solar radiation increases the temperature of surfaces.

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.

Science fair project that tests the effects of temperature change on the reactivity of the catalase enzyme.

Check out this fun science fair project idea to explore fun facts about fruit juices and learn why do juices turn bad in the fridge.

Have fun with bubbles and find out why there are bubbles in your tap water in this cool science fair project idea.

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

Check out this fun science fair project idea to determine if the size of a particle affect the rate or speed of a chemical reaction.

Check out this cool science fair project idea to explore non-chemical means of preserving fruits by using thermotherapy.

Study the impact of environment on seed germination among three materials: soil, paper towel, and cloth. Note when seeds germinate and how well they germinate

The purpose of this science project is to investigate which will grow larger plants: compost, soil and Miracle - Gro, a mixture of both.

What is the coldest temperature possible? In this cool experiment, you'll calculate absolute zero by extrapolating data on the temperature and volume of gas.

The purpose of this science project is to determine which chemical best lowers the temperature of water in a cold pack and if the amount affects its use.

This project examines the affect of temperature on viscosity and surface tension of different liquids.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

This measurement activity uses feet to compare objects, but not the ones found on rulers and measuring sticks...the feet on your child's own body!

This science fair project idea measures physical dexterity as a function of temperature.

This experiment investigates if small changes in your diet can alter your basal body temperature.

This science fair project idea focuses on saturated and unsaturated lipids (fats and oils).

This science fair project idea investigates food preference of birds.

This experiment evaluates if the temperature of the environment that you work in affects your ability to perform mental tasks.

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

This project examines how temperature affects the volume of gas in balloons.