A couple of posts here really sum this up.
1. We already absorb much higher energies in radio waves from TV and radio signals.
2. WiFi networks are pretty much everywhere. I guarantee that all of those kids that live in an urban area are in in a wireless network range of someone's network. My mac recognizes about 20 wireless networks. Not having a WiFi router in your house does not mean that there is no WiFi signals passing through your house. If anything the signals would be stronger at home than at school.
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