What are the benefits of good posture? Kids will learn about the cognitive effects of good posture through conducting and observing a controlled experiment.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

In this math and science activity, help your middleschooler learn about proportion and measurement with just her shadow and a tape measure!

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

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

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

This experiment will examine and precisely measure the amount of sugar in various sodas.

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

Has your kid noticed how much bigger the moon looks when it's low in the sky? Here's an activity you can do to show them that it's just an optical illusion.

Science fair project that measure winds speed, temperature, and time of day in order to determine the origins of the wind.

Become familiar with ratios and learn how to measure the diameter of the Sun and the Moon in this fun science fair project idea.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Measure the porosity of rocks by submerging them in water. Measure how much water each rock "drank," by measuring the difference in water volume.

Here's a fourth grade science craft with lots of benefits: it's good for birds, good for your child's learning, and good for the planet, too.

This science fair project idea determines if family members can recognize one another using only the sense of smell.

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

This science fair project determines the quality of a given product.

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.

In this science fair project, students make their own rain gauge to measure rainfall.

Determine how good we are at direct and indirect observation.

This surprisingly good glue recipe comes from common kitchen items.

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

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.

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.

In this science project, learn about soil porosity and measure the percent porosity of sand, silt, and clay.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

This science fair project idea determines what household items are good conductors of electricity.

Check out this fun science project idea to measure the amount of vitamin C in ripe, half-ripe, unripe and stored oranges.