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This week's experiment got its start while I was reading Craig F. Bohren's "What Light Through Yonder Window Breaks." It is a book on atmospheric physics, and is written so that you don't have to be a physics professor (or even a physics student) to understand and enjoy it. He writes about the dew that forms on your house windows in the winter, which made me think of other questions about dew drops.

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This week's experiment came from Diane in South-central Pennsylvania. She and her son were discussing ceiling fans, and how they make you feel cooler. Do they actually cool the room?

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The Smell of Money

A magic trick that can teach about observation and the senses.

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Straining a Flame

Why can't a flame go through a metal screen? Try this fun experiment to explore the science of combustion and heat.

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 time our experiment is one that winds up in lots of science fair projects. Does color have an impact on how things absorb heat?

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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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This experiment was sent in by Leilah, an 11 year old list member from Indiana. It is exactly the kind of experiment I like, because it is simple, it makes you think, and it’s interesting enough to get you to actually try it, instead of just saying, "Wow, I'll have to try that some time."

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This project has science fair potential.

Is the cheese on a pizza really hotter than the crust?

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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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Can you lift an ice cube out of a glass of water with a string? Try it and see.

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It is amazing how many books get this one wrong!

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