I see these things in all the subway stations sticking out of the roof, blink in various different colors and I have yet to figure out what these are broadcasting or picking up, I was thinking cellphone signals as there is reception underground but then its doesn't seem like these small devices could handle the data transfer, and also there is a frowning upon here when people use their phones on the trains. People find it very rude when people are talking on their phones around other people, so on the train its quiet with everyone on their phones, but emailing and texting each other. Which is in stark contrast to 3rd world countries where is an act to take pride in when talking on your phone in public. In Mexico its gone nuts with the Nextels where everyone around you hears the whole conversations all the time. I cant Stand the Nextel system at all, it's good in some cases but its ridiculous when try to have a proper conversation on it.
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