So many wireless equipments are around us, cellphones, WiFi/AirPort computer networking, Bluetooth keyboards and mice. I know basicly the vendors have tested the EMF (electric and magnetic fields) exposure before their products go into the store.
They always say it doesn’t pose a health risk. I trust the test is followed the rule and the individual equipment’s EMF exposure is not over the limit. But what about when four or five itmes work at the same time.
Let me provide some basic information of EMF.

EMF (or ElectroMagnetic Field) is a broad term which includes electric fields generated by charged particles, magnetic fields generated by charged particles in motion, and radiated fields such as TV, radio, and microwaves. Electric fields are measured in units of volts per meter or V/m. Magnetic fields are measured in milli-Gauss or mG. The field is always strongest near the source and diminishes as you move away from the source. These energies have the ability to influence particles at great distances. For example, the radiation from a radio tower influences the atoms within a distant radio antenna, allowing it to pick up the signal. Despite the many wonderful conveniences of electrical technology, the effects of EMF on biological tissue remains the most controversial aspect of the EMF issue with virtually all scientists agreeing that more research is necessary to determine safe or dangerous levels. Iron, necessary for healthy blood and stored in the brain, is highly effected by EMF. The permeability of the cell membrane of our nerves, blood vessels, skin, and other organs is effected. The intricate DNA of the chromosomes has been shown to be effected by EMFs as well. In fact, throughout our bodies, every biochemical process involves precisely choreographed movement of EMF-sensitive atoms, molecules, and ions.

On the March/April 2006 issue, there is an article, Lakehead U forbids wireless networks on campus.
It says the president, Fred Gilbert won’t allow the wireless Internet access until he’s satisfied EMF exposure doesn’t pose a health risk to young people. He cited studies done by scientists for the California Public Utilities Commission, whose findings boil down to the fact that while there is no proven link between EMFs exposure and diseases such as leukemia and brain tumours, the possible risk warrants futher investigation. He also said Canadian regulation allows for a higher minimum degree of exposure ot EMFs than do some other countries.
I believes there are many environmental impacts that are not manifest for 30 to 40 years after exposure. “Secon-hand tobacco exposure is a case in point.”
So that, I use the wire network on the CAT5 cable which I pulled by myself.

David Yin

David is a blogger, geek, and web developer — founder of If you like his post, you can say thank you here

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