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

Determine which factors promote the greatest memory interference. Administer test, time how long it takes subjects to complete different tasks.

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

This activity is a fun way for your first grader to learn about how veggies help your body while being creative with art and drama. Here's how to get started.

Your mission, if you choose to accept it, is to construct a parachute that will deliver an egg safely to the ground. Good luck!

Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

In this science experiment, test the pH of soil surrounding a gas station to determine if gas stations have a negative effect on the environment.

How does mold grow? Kids find out by testing different conditions to measure mold growth rate and learn about what factors cause mold to grow more quickly.

This project explores how well couples convey complex emotions such as envy and pride to one another solely through the sense of touch.

This experiment uses a voice recorder to monitor the progression of a message in the telephone game as it deviates from the original.

Learn how the focal length of a lens affects a magnifying glass's magnifying power in this cool science fair project idea for 8th grade.

Determine how effective animal camouflage is by simulating it in an indoor and outdoor setting.

Experiment with the wonders of pressure and condensation by crushing a soda can with nothing but air and water!

Do your laundry and your science project simultaneously! This science fair project investigates whether the color of a garment affects the time needed to dry.

Create homemade seed packets with your kids. This activity combines your kids' love of science and the outdoors with a little writing and drawing fun.

Help your kindergarten scientist understand the concept of surface tension with this simple science experiment.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

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

Research long-term effects and draft a questionnaire about frequency of marijuana use and average annual income. Interpret findings in a detailed report

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.

The garden is the perfect place to practice math and science with preschoolers. Get digging (and counting, sorting, observing at the same time!)

This experiment strives to determine if tracking of conservation habits will lead to reductions in a family's electricity and water bills.

Have your little astronaut create her own crater-filled moon with this fun craft project that encourages learning about the final frontier.

Learn the anatomical and physiological differences between central and peripheral visual systems.

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

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

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

This experiment works due to a simple principle: plants need light. Build a shoebox maze and watch the plant work though the obstacle course, searching for sun.

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.