WIFI!! saw this from a site... it was a cool site
but ya, apparently in japan there is this wifi thing that could help you track ur children! like the GPS or smthing like that...
hmm, well, it could be a good thing, but i'm sure you've all once been a child, and do you even like the idea that ur parents know where u are every second of the day? = =
even if they're our parents, it feels creepy to be stalked by them that way, you know? =/

for more info, go to the link below:
http://www.engadget.com/entry/1234000120072563/

or look it up, if you live in japan... lol