This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

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

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

Science fair project which measures whether tsunamis are more destructive when they are caused by an earthquake or by a meteor.

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

Here's an experiment that will have your child experimenting with cake ingredients to learn about the chemical reactions that happen when a cake's in the oven.

In this experiment, students will discover how heat and pressure turn clay into slate, phyllite, and finally schist.

Make sourdough bread...and learn some colonial history and modern science in the process!

This science fair project idea explores whether people have an innate feel for the passing of time from a few seconds to 20 minutes.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Total alkalinity and pH personal care products are controlled to prevent skin irritation. Learn more about basic and acidic substances in this science project.

Construct batteries that make electricity from fruits with this fun science fair project.

Check out this cool science fair project on identifying rocks and minerals for kids.

Is horse manure a possible energy source in a crisis? Use calorimetry to find out how much energy horse manure can produce in this science fair project.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.