Internet is improving very fast. We can see a lot of Wi-Fi spot. Some places provide Wi-Fi as free. Some Wi-Fi band is used 2.4GHz. http://en.wikipedia.org/wiki/Wireless_LAN An alternative ATM -like 5 GHz standardized technology, HiperLAN/2 , has so far not succeeded in the market, and with the release of the faster 54 Mbit/s 802.11a (5 GHz) and 802.11g (2.4 GHz) standards, Then the band is almost same as microwave oven. http://en.wikipedia.org/wiki/Microwave_oven A microwave oven works by passing non-ionizing microwave radiation , usually at a frequency of 2.45 gigahertz (GHz) … So, if you are always in Wi-Fi area, it may be same as you are in microwave oven… … http://curezone.com/foods/microwave_oven_risk.asp Microwave oven may have danger for us…