Yes, read this:
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20 minutes on a mobile phone running at typical power levels would be
equivalent to about 1 hour in a classroom with 20 wLAN PCs.
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One day at school = 2 hours on the phone due to wi fi in the classroom,
it's shocking especially amid the concerns and advice given by the
governments own advisor on the matter that children should not use
mobile phones.
Myth: Being on a phone for 20 minutes is equivalent to 1 year
in a wifi classroom:
http://www.powerwatch.org.uk/news/20...wifi_myths.asp