Here's a math activity that uses coin riddles to help your third-grader improve his coin-counting and logical thinking skills.

Science fair project that determines the correlation between the ability of selected materials to conduct heat and a material's density.

Salmonella and E.coli are common food contaminates. This experiment measures the time it takes for E.coli and Salmonella to reach hazardous levels in fish.

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

The objective of this science fair project is to examine the cleanliness of salad preparation techniques.

This experiment will evaluate bacterial content on toothbrushes before and after different cleaning methods to determine which method of disinfecting is best.

The objective of this science fair project idea is to determine whether frozen vegetables have more nutrients than canned vegetables.

This science fair project will help learners determine whether algae can be made to grow by feeding it supplementary carbon dioxide.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

Kids will create their own version of Richard Feynman's rubber band heat engine to learn about thermodynamics with this cool science fair project idea.

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

Learn about calorimetry, make a bomb calorimeter, and experiment with combusting different nuts to see which one produces the most energy!

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.

Kids discover what a homogeneous mixture is by adding sugar to distilled water and identify the various factors affecting solubility.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

How does bleach kill bacteria? Kids find out in this impressive bacteria science fair project by testing different concentrations on a safe strain of E. coli.

This project examines the concentration of dissolved oxygen in water, with and without oil.