Here is a picture of unknown origin showing a classroom with 20 students, 3 teachers and 20 computers. You can see the computers aren't using wires to log on to the internet. Wi-Fi routers are supplying the room with the required frequency to communicate with all of the computers. Here is your wireless quiz?

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What is the total number wireless devices in the room interacting with Wi-Fi frequency?

A) 20

B) 23

C) 43

You would be suprised how many professionals got this question wrong. Here is a link to show you what was missed in the Wi-Fi discussion and there are 2 reports on the safety of Wi-Fi that also missed the question above. One from BC CDC and the other from Ontario checking Simcoe County Schools. Here is the Health Advisory showing Wi-Fi is not safe and illegal with the reported error or omission in safety standards.