WiFi health dangers?

I read with interest about the health dangers over wireless connection.

I know that mobile phones emit microwaves that is said to be hazardous to one's health. I think there's may be some merit in that WiFi signals also do have some concerns.

Well at least one California city has turned down a free wifi due to the health concerns of a few.

I mean just sitting at home and looking at my notebook, I already see 11 different WiFi signals from various houses around me !!