Marni

**Cellular Phones. What they do, and how they work.**
====Cellular Phones transmit and receive signals using high frequency microwaves. There are electromagnetic waves, everywhere. Most wireless items work using electromagnetic energy. When speaking into a cell phone the sound of your voice converts from a up-and-down sound of your voice, into a pattern of electrical signals. The numbers in a phone are stuffed up, and put into a radio wave and then is sent out, from the phone's antenna. A mast is a tall upright post, or other structure. When the sound of your voice is sent out, it travels all the way to the mast that collects the radio waves, and then is sent out. This all happens very quickly. And that is the good thing about being able to send messages via SMS or speaking, like on a phone call. Calls that are made from different land lines or from a different network, take longer time to be sent. Almost always, different calls, from different people and different locations, happen at the same time. And if there weren't any masts, the phone calls will be scrambled together, and then making a phone call to somebody wouldn't be as easy. A frequency, is a rate at which something occurs. And if every phone call (or phone) uses a different frequency, it is a lot easier to keep the phone calls separate and not mix up. And during phone calls, the more cells there are, the bigger amount of phone calls can be made.====

====Glucose is something very important in your brain. It's an energy source for the brain. People use phones daily, and probably a couple times a day. Using a phone is very important to a lot of people, and people obviously use it very often. So, when people are using a phone, it is placed near the brain, and even though when you are on the phone, you don't think very hard, but still glucose is used. That's the energy source that's being used while you're on the phone. But it hasn't yet been proven whether using a lot of glucose is good or bad for the brain, and people are not yet sure whether there is a negative affect on humans' health.====

**- Uses more energy (glucose)**

 * - And not sure yet if it's good or bad**



Woodford, Chris. "Cell Phones (Mobile Phones)."//explainthatstuff.com// (2006): 1. Web. 11 Apr 2011. .