Ubiquitous Bluetooth and PAN - Personal Area Network

[F2d5thCav]

I recently have had a new, strong WiFi signal pop up.  So I put an app on my telephone that tells me which signals are present, and their strength.  Walking around, it appears the new signal is coming from a building across the street.  I suppose their WiFi router is next to the window and beaming directly down to where my laptop is.  Maybe I should start wearing tinfoil on my head!

Cheers