Dan Murtaugh
The Volocopter was introduced at the Frankfurt Motor Show two years ago. (Photo: Alamy)

Opening up the sky for flying taxis

2 min read . 13 Oct 2019
Horizontal drilling and hydraulic fracturing in hydrocarbon-rich underground shale layers have helped US oil production grow 65% in the past five years to the highest level since 1986. Photo: Bloomberg<br />
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