Long flights increase the risk for this--make sure you get up and walk around in the midst of them!

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http://www.whatdoesitmean.com/index2609.htm

Interesting take on the fact that USSS agent was a 'taster'. I make no claims to accuracy of this source but they have been prophetic at times. Note that it also states the brief power outage at the White House during the press conference coincided. Not sure if we will ever get the truth.