Q: Gradually over the last 3 hundred years, this has increased in size by almost 600%. What is it?
Q: When you add it up, men will spend 3 weeks of their life doing this. What is it?
Q: At any given time on earth there are just over half a million people doing this. What are they doing? A: Flying. Image courtesy ESA/DLR/SES via Daily Mail.uk
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