GRAMMY ON THE GO
Shell Games
By Karen Shadrach
It’s spring, the time when plants sprout, animals are born, and the earth wakes up after winter.
Eggs have long been a powerful symbol of the season, representing new life, rebirth and renewal, connecting to both nature and cultural traditions around the world.
The egg: It looks simple, smooth and oval, but inside that shell is a perfect little science lab. With a few household items, kids can explore chemistry, physics, and even a bit of biology, while having fun.
To make egg experiments extra fun, let the kids make predictions before you get started. If a mistake is made, turn it into a discovery; science is full of surprises. Ask them why they think something happened, even if they’re not sure. The experiments below are designed to inspire curiosity and spark conversations.
Venture beyond coloring and hiding eggs with these do-together egg experiments.
The Floating Egg Trick
For this experiment, you will need a raw egg, a glass of water and salt. An egg sinks in plain water, but if you stir in enough salt, the egg suddenly floats. Let kids slowly add and stir in the salt until the egg rises from the bottom of the glass. Older grandkids can track how much salt is added.
Here’s why: saltwater is denser than freshwater. When the water becomes dense enough, it can support the egg’s weight. This is the same reason people float more easily in the ocean than in a lake.
The Bouncing Egg
This one requires a raw egg, a cup and enough vinegar to cover the egg. Add food coloring if you want. When you soak an egg in vinegar for about 24-48 hours, the shell dissolves. What’s left is a rubbery, translucent membrane that lets you see the yolk inside. The egg becomes squishy and bouncy. Kids love it because it’s weird, it’s wobbly, and it looks like something from a sci-fi movie.
Here’s why: Eggshells are made of calcium carbonate. Vinegar contains acetic acid. When they meet, they react and release carbon dioxide bubbles. As the shell dissolves, the membrane remains, giving the egg its new texture.
The Spinning Egg Test
Two eggs are all that is needed for this test: one raw and one hard-boiled. Have the kids spin both eggs. The hard-boiled one spins smoothly; the raw one wobbles.
Here’s why: Inside a raw egg, the liquid moves independently from the shell. That sloshing slows the spin. In a hard-boiled egg, everything moves together, so it spins cleanly. The kids love this because it’s a simple, hands-on way to learn about inertia and motion.
The Egg-in-a-Bottle Challenge
For this experiment, have the kids peel a hard-boiled egg and give them a glass bottle with a mouth slightly smaller than the egg. A glass vase or wine pitcher works well for this. After they see that the egg cannot fit into the glass, use a match to light a small piece of paper and drop it into the bottle. Have the kids quickly place the egg on top. As the flame goes out, the egg gets sucked into the bottle.
Here’s why: The flame heats the air inside the bottle. When the flame goes out, the air cools and contracts, creating lower pressure inside the bottle. The higher air pressure outside pushes the egg inward. The grandkids will love this one because it’s dramatic, surprising, and feels like a magic trick with a scientific twist.
The Strength of an Eggshell
Get four eggs and a book or a small stack of books. Have the grandkids place the eggs upright (pointy end up) in a square formation. Carefully set a book on top. You’ll be amazed at how much weight the eggs can hold without breaking.
Here’s why: Eggs are shaped like tiny arches. Arches distribute weight evenly, making them surprisingly strong… strong enough to support several pounds. Kids love it because it’s a great “bet you didn’t know” moment.
Egg experiments are more than just messy fun; they’re a chance to explore the world together. Science becomes real when kids can touch it, watch it and laugh about it with someone they love.
