How Do Your Lungs Help You Breathe? Your lungs help you take in oxygen and release carbon dioxide every time you breathe. In this experiment, you will build a simple model that shows how your lungs expand and contract. Materials 1 clear plastic bottle 2 balloons 1 straw Tape or rubber bands Scissors (adult help recommended) Experiment Steps 1. Prepare the bottle Cut the bottom off the plastic bottle with adult help. 2. Attach the balloon inside Stretch one balloon over one en

How Do Plants Drink Water? Plants do not have mouths, but they still need water to survive. So how does water travel from the roots all the way up to the leaves? In this experiment, you will use celery and food coloring to see how water moves through a plant. Materials 1 celery stalk with leaves A clear glass or jar Water Food coloring (any color) Knife (adult help recommended) Experiment Steps 1. Fill the glass Fill a clear glass with water and add several drops of food colo

Have you ever wondered what DNA looks like? DNA is the tiny instruction code inside every living thing, including plants, animals, and humans. Normally DNA is so small that you need a powerful microscope to see it. But with this fun experiment, you can actually  extract DNA from a banana and see it with your own eyes . It may look like white, cloudy strings floating in the liquid! Materials 1 ripe banana ½ cup warm water 1 teaspoon salt 1 tablespoon dish soap Rubbing alcohol

Have you ever wondered how cells control what goes in and out of them? Every cell is surrounded by a  cell membrane , which acts like a tiny protective barrier. The membrane keeps important materials inside the cell while allowing certain substances to enter or leave. In this colorful experiment, you can see how soap interacts with fats in milk, which helps us understand how cell membranes work. Materials A shallow bowl or plate Whole milk (enough to cover the bottom of the p