This week's experiment came from a shopping trip. I recently paid for my groceries with a $50 bill. Most stores test large bills with a special pen, to see if they are counterfeit, but this store had run out of the special pens. Instead, they put a drop of iodine on the bill to be sure that it was good. To see why, 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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This week's experiment seems to be a magic trick, but the basic idea is very useful. It is the idea behind the self sealing tires that seal themselves after you run over a nail. To try this, you will need:

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Having a home at the beach, I tend to spend a lot of time building sand castles. Now while it may seem a frivolous activity, there is really quite a bit of science involved. To see some of the science of building a sand castle, you will need:

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For this week's experiment, we are going to investigate a very important substance which most of us take for granted. Salt. While we hardly think about it as we sprinkle it on our food, in the past, salt was a very important and valuable substance. In addition to enhancing flavor, it is a vital substance in our diet. Before refrigeration, it was a very important way of preserving food.

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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 is the really a prelude to next week's. I wanted to do an experiment on how to kill a magnet, but before you can kill one, you need to know how to make one.

To make a magnet, you will need:

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This week's experiment is one that I have been playing with for quite some time. It is something that I first noticed when I was a child in school. Way back then, we watched educational movies sometimes in class. There were no VCRs or video tapes. Instead, the film was on big reels and fed through a movie projector. When the movie was over, you would rewind the film back onto the reel, and as the reels were spinning quickly, you could see bands of yellow and blue light, like the spokes of a wheel on the reels. Since then, I have found several other ways to see these blue and yellow bands. For this demonstration, you will need:

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Today was a wonderful day! We went to the Everglades and saw lots of wildlife. Part of the fun of traveling is getting to play tourist, and National Parks are some of our favorite tourist stops.

It was dark by the time we left the Everglades and on the way out, we were watching very carefully in hopes of spotting a Florida panther. We did not see one, but it did give me the idea for which experiment to do this week. Have you ever seen the glow of an animal's eyes reflecting the headlights on a car or the flashlight you are holding? If not, you can try it. You will need:

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Last time, we magnetized paperclips. This week we will see if we can demagnetize them. You will need:

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This week's experiment uses a computer CD or DVD. If you have ever looked closely at either a music or computer CD, you have probably noticed that they produce rainbows. If you hold the CD with the shiny side up and let light from a lamp reflect off of it, you will see a very nice rainbow of colors. If you are using a regular incandescent bulb, you will see all of the colors of the rainbow: Red, orange, yellow, green, blue, indigo, violet. If you use other kinds of bulbs, you may find some colors missing. To try this, you will need:

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This project has science fair potential.

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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This week's experiment uses fire, so be very careful and be sure that you have an adult to help you.

This week's experiment involves both chemistry and light. It is always pleasing for me to find one experiment that can send you exploring in several different directions.

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This week's experiment is a fun one and a yummy one too. (I was hungry while I was choosing it.) We are going to experiment with the impact that vitamin C has on the browning of fruit.

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