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The US shot down what they believed to be a Chinese spy balloon at the start of February, sparking a global discussion on what the UFO could have been.
But in an age of drones, satellites and hi-tech spy planes, why would any world power still be using balloons for surveillance?
An expert explains the reasons a technology first used during the French Revolutionary Wars remains so in demand today.
Please subscribe HERE http://bit.ly/1rbfUog
#BBCNews
But in an age of drones, satellites and hi-tech spy planes, why would any world power still be using balloons for surveillance?
An expert explains the reasons a technology first used during the French Revolutionary Wars remains so in demand today.
Please subscribe HERE http://bit.ly/1rbfUog
#BBCNews
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