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Need to add another trick to your repertoire? Here’s a different way of writing with invisible ink.

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Can you keep a secret? How would you send a secret message? What if it fell into the wrong hands? Spies and the military of all nations have been sending secret messages since ancient times. They all developed ingenious codes to protect their battle plans and valuable information from prying eyes. The art of encoding or decoding these secret messages is called “cryptography.”

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Did you know that before it pops, the skin of a soap bubble is only one-millionth of an inch thick?

The colors of a soap bubble come from white light, which contains all the colors of the rainbow. When white light reflects off of soap film, some of the colors get brighter, and others will disappear. We’ll show you how to make your own bubble solution. Then you can try some experiements with bubbles to learn more about them!

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Experimenting with eggs is fun. In this experiment, you’ll learn how to make turn a real egg into a “rubber” egg that can bounce!
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When water is heated, its molecules move more rapidly as the heat increases. Because the molecules are jumping around, and evaporating into the air more quickly, the hot water is less dense. Cold water has slower-moving molecules that tend to sink because of their density. Try this cool experiment to learn more about water and its properties.

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Fossils are the imprints of plants or animals of a past age that have been preserved in the earth’s crust. Real fossils take millions of years to form.

You’ll be able to make one in just one or two days! To get an idea of how a fossil is formed and what it might look like you start with a mudpie!

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If you like to mix up weird experiments from the stuff in your fridge, here are two ideas that will put your goop to good use. Not only are these fun experiments in kitchen science, but they are much better for the environment than store-bought shampoos and conditioners which might not be biodegradable. Substances that are not biodegradable pollute the water after they go down the drain.

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Use these soap crayons to write on the tiles or to color your bathtub.

This is a fun project, especially for kids who think of the bathtub as their exclusive playground, the one place where making a mess is really cool.

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A cruise ship in the bath tub or plastic tub?

Rolling along the high seas with Rubber Ducky? Why not? Especially if you can learn some scientific lessons along the way. Here is a fun project that satisfies both the seafarer and investigator in any kid.

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Here is a nice, amusing experiment. Try it in a vase you cannot see into if you want to surprise someone.

At the very least, it will help show how quickly water ingredients travel up a stem into a petal.

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Unlike the biplane that inspired Amelia Earhart to become a pilot, modern jets do not have propellers. How does a jet move through the air? By Action and Reaction. When a jet takes off, hot gasses shoot out of the back of the plane. That’s the Action part. The plane is pushed in the opposite direction and that’s the Reaction part. As long as those hot gasses are blasting out toward the back of the plane, the jet plane will shoot forward.

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The speed of sound was first measured in the 17th century, but it remains something to marvel at. This is because of the way that the speed of sound is related to the density of material that it is passing through. Here are some nice ways to understand this phenomena.

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