This week's experiment comes from a question that I received about which is better, AM or FM radio. As we shall see, the answer depends on what properties you are basing your answer on. As we will see, each has advantages and disadvantages.
This experiment comes from a question sent to me by a subscriber. His question was, "If I were standing directly on the South Pole and I was holding a compass, where would the needle be pointing?"
Lets do this scientifically. Before you read on or try the experiment, think about it. Think about what you know about magnets. Think about how a compass works. Once you have come up with an idea of what you think would happen, then you will be ready to try this.
I am sure that you have seen breakfast cereals that claimed to be enriched with iron. You may have thought that the manufacturer added some extract from spinach or liver, but the actual ingredient may surprise you.
This experiment is one that I stumbled upon while working on another idea. That seems to happen to me frequently. I was planning to magnetize a needle, and as I was sorting through all the magnets on our refrigerator, I got sidetracked into playing with the rubber magnets (which are really plastic, not rubber). The more I played; the more interesting it got.
Science can be found all around you, in every part of your daily life. Sometimes it is fairly obvious, such as the chemistry of a burning candle or the physics of a storm. Other times, it takes a bit of exploration to make it easy to see. That is the case with some of the science behind a credit card.