Seing-ji

Notes:
==Cell phones needs energy that travels around in space and spreads out. The phone tower gives energy to the phones. We can't see this energy but it's out there in waves. The type of electromagnetic energy used is called radio- frequency(RF) energy. When you call some one it sends microwaves. Cell phone towers picks up the micro waves and sends the signal to another phone. When you make a phone call, it often occurs that you are not the only one making a call at that time. If every phone uses a different frequency, the phone calls won't get mixed up. Cell phones are recievers and senders. == = = =**__How does the applience affect human health __**=
 * ==Cell phones use high frequency microwaves. ==
 * ==Cell phones only work if they are near cellular systems. ==
 * ==Cell phone towers picks up the microwaves and send the signal to another phone. ==
 * ==Cell phones are low powered radio. ==
 * ==Cell phones work like radio phones. ==
 * =Having your phone makes your brain work harder =
 * ==It uses more energy ==
 * ==We still don't know if it is good or bad ==
 * ==Glucose is kind of an energy source ==