This fun marbled paper craft uses things you're likely to have around your house, and it teaches kids some simple chemistry too!

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

What's cooler than an explosion? Not much! This simple science experiment lets kids build their own pop rocket. So put on your safety goggles and let her rip.

This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.