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| Carl Sagan's COSMOS is one of the most influential science programs ever made.
Q. Does the moon have a dark side?
A. The moon does have a far side which is impossible to see from the earth, but it doesn't mean that it's always dark. Each side of the moon is dark for no longer than 15 days at a time.
Q. Where does sound come from?
A. The air is always filled with sound waves. All things give off vibrations, but some have a low frequency which most cannot hear. The reason: it may take 3 minutes to make a single vibration. They may be caused by earthquakes and storms.
Did You Know?
The microwave was invented after a researcher walked by a radar tube and a chocolate bar melted in his pocket.
Coke-a-Cola was originally green.
Rubberbands last longer when refrigerated.
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Chinese Water Torture
by Jeanette Cain
Do you know how mushy your soap gets when it's left in water? A lot of the soap bar will be wasted when just sitting on your shower caddy as the water falls upon it. This experiment is to test how much soap will be eroded when a small drop of water hits the bar for several hours, or overnight.
YOU WILL NEED:
1. Bar of soap
2. Faucet that your parents will allow to drip slowly for that amount of time.
3. Scales to measure the weight of the soap bar before and after.
First, weigh the soap bar and write it down. Put the soap bar in the sink, then let a slow, but steady, drip of water hit the bar. (Best to wait until EVERYONE has washed up for the night!) Let the water drip overnight.
The next morning weigh the bar of soap to see how much of the soap has been eroded. Well?
Try testing different soaps for hardness to decide whether some soaps last longer than others. If so, which bar cost the most? Was it a good buy? Are some brands better and more economical than others?
For serious experimenting measure the number of water drips per minute or by the hour. You will calculate the weight of, say, 100 drips by collecting and weighing. Next, calculate the velocity of the water drops by height. Thirty-two feet per second each second, or 32 feet per second squared.
You could try making a change in the velocity in height by using the shower head, then compare to the erosion of the soap under the faucet.
You can also measure larger rain drops, which cause more bar erosion. Larger rain drops happen in cooler weather. Why not measure rain craters in fine powder?
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