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Probably, it is at least partly down to our crowded airspace. "Within UK airspace, the operation of balloons and kites are subject to teh provisions and requirements set out at Articles 163 and 164 of the Air Navigation Order 2009 (which is contained in CAP 393). Amongst other things, these Articles provide that CAA permission is required to operate a tethered balloon or kite more than 60m above ground level (agl)."http://www.caa.co.uk/docs/33/DAP_PolicyStatementOperationOfTetheredBalloonsAndKites.pdf[^]
They also have strict provisions for untethered balloons, particularly if they start to reach decent altitudes.
If you get an email telling you that you can catch Swine Flu from tinned pork then just delete it. It's Spam.
This is one of my favorite of these such videos. The acceleration when she released the balloon was quite intense. It's also good to see girls getting into science. Every time I see the views from 47k + feet, I go "oh, wow."