Test out various brands of permanent markers to see which one is least water soluble.

Discover which battery composition (type) lasts the longest.

This science fair project idea explores which fruit molds the fastest.

Determine which metal has the highest rate of conductivity.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

Find out which type of sponge holds the most water.

Which battery lasts the longest? In this science fair project, kids will test popular brand name batteries like Duracell and Energizer against generic brands.

Which bread molds fastest? Explore the different kinds of breads and how quickly they mold, along with the role of preservatives.

Determine which seeds are most likely to survive harsh winter conditions (low temperatures).

This science fair project idea explores which kinds of earplugs are the most effective.

This science fair project idea discovers which brand of bubblegum produces the largest bubbles.

The goal of this science fair project is to determine which cheese grows mold the fastest: Vermont Cheddar, American, Brie, or Camembert?

This science fair project idea determines which flower lasts the longest.

Explore which teeth-whitening products work best - Whitestrips or Whitetrays.

This project examines which style of central-air system filter traps the most particles from the air.

There is debate about whether chalkboards or whiteboards are better. This experiment explores which leads to better retention of visually-displayed information.

Find out which part of a flame burns wood the fastest and also if this is true for all types of flames such as candle-flame, burners, and lighters.

Compare the whitening abilities of four different brands of whitening toothpaste to see which one whitens the fastest and which one whitens the most.

Determine which video game elevates the heart rate best and burns the most calories.

This science fair project idea studies which kind of rock (sedimentary, igneous, or metamorphic) is most damaged by frozen water.

This educated-guessing game is great for preschoolers. This activity helps your child work on her reasoning skills.

This science fair project idea studies which brand of wintergreen candy produces the most sparks in the dark.

Observe which kind of fresh long-stemmed flower will last the longest after being picked.