The US shot down what they believed to be a Chinese language spy balloon at the beginning of February, sparking a worldwide dialogue on what the UFO may have been.
However in an age of drones, satellites and hi-tech spy planes, why would any world energy nonetheless be utilizing balloons for surveillance?
An professional explains the explanations a expertise first used through the French Revolutionary Wars stays so in demand at present.
Please subscribe HERE http://bit.ly/1rbfUog
#BBCNews
