We all know that sitting on a hard wooden or plastic chair all day can become uncomfortable after awhile. In order for you to be more comfy while you are learning, you are going to design a seat cushion, using what you have learned about matter and the characteristics that differentiate one substance from another.

You might say to yourself, "Hey, that's not so hard." But wait, there's more to this project than what you might think. You must include all of the following when designing and building your seat cushion:

• Use 3 or more materials
• Weigh no more than one pound
• Use a material that is a solid
• Use a material that is a liquid
• Have a handle on it so you can pick it up easily
• Be easy to transport
• Not become flat when someone heavier than 100 pounds sits on it
• Be cool looking as well as functional