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

Did you ever drink spoiled milk? Find out whether whole milk spoils at the same rate as 2% and skim milk.

This science fair project idea discovers the effect of (high) heat on animal cells.

Kids will get a kick out of shopping for discounted "kicks" with this creative math game that focuses on percentages.

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

Save money by making compost! Use this science fair project idea to determine which composting methods best encourage decomposition of organic matter.

Compare air temperature with the infrared temperature from a reflecting surface at different times of the day, in shade and in sunlight.

This science fair project explores different types of endangered frogs, and why some are endangered while others are not.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

Can cells be frozen? This science fair project provides information to answer this question.