This week, we are going to produce some floating bubbles. Our bubbles will be filled with ordinary air, and will be floating on a layer of a heavier gas. To try this, you will need:

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Today we actually had some much needed rain. To celebrate the rain, I thought I would do an experiment that was related to rain.

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A few weeks ago, we looked at a classic experiment of putting a lit candle under a glass. We saw that water was drawn into the glass, not by the oxygen being burned up, but by the cooling of the air in the glass after the candle went out. This experiment will allow us to do what many people thought the first experiment was doing, measure the amount of oxygen in the air.

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This is an experiment that was sent to me by Bob Burk a few weeks ago. His son showed it to him and he was nice enough to pass it along to me. With the holiday season upon us and New Year's just around the corner, I thought this would be a fun one to try. You will need:

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This week's experiment came from a conversation that I had with a friend about how things react to hot and cold. This is an easy way that you can observe what is going on as you change the temperature of some air. You will need:

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For this week's experiment, I wanted something that related to hurricanes. I settled for one that is based on fast moving air and differences in air pressure. You will need:

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This week's experiment should be familiar to any of you that have ever cooked pancakes. As my mother taught me, and as you will find in most cookbooks, in order to tell if the skillet is hot enough for pancakes, you dip your fingers into some water and then shake a few drops onto the skillet. If the drops just sit there or if they hit the skillet and boil, then it is not hot enough. As the temperature of the skillet increases, you reach a point where the drop of water seems to bounce and glide around the skillet. Then you know that the skillet is hot enough for pancakes. This is called the Leidenfrost Effect, and that is what we want to observe now.

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We are used to associating electricity with light bulbs, but most people expect it to take a lot of power to light them. For incandescent bulbs, that is true, but with fluorescents, things are a bit different.

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Warning! This experiment uses fire. Be very careful and be sure an adult is around to help.

This time we are going to explore a gas called carbon dioxide. It plays an important role in the lives of plants and animals, and it has very specific chemical properties. We can use those properties to do some surprising things.

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We are used to thinking that it takes a lot of energy to produce light. This time, we will see that even a small amount of the right kind of energy can give us some light.

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Why is half a water balloon different from a full one?

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This week's experiment came to me from my good friend Bob Cox. He told me about the trick and wanted to know why it worked. It took some thought and testing to come up with a theory of what is happening and then several e-mails to experts to confirm that I was on the right track. For this week's experiment, you will need:

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Which will go out first, the tall candle or the short one?

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The answer to the last video's challenge.

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