The Esa said it was not interested in the features drone owners designated as their virtual docking port - it wanted to gather data only about the way humans navigated the robot craft.

BBC: Esa seeks help to control robot spacecraft

If you've been wondering what all the Google this, Glass that fuss is all about, Mountain View's revealed what it'll be like to actually port a pair of its upcoming virtual specs with a new video, now that it's announced limited availability of the wearable computer.

ENGADGET

Virtual border guards are also being tested, with the US Customs and Border Protection trialling a kiosk at Dennis DeConcini Port in Nogales, Arizona, a border crossing between the US and Mexico.

BBC: Airport avatars offer travel advice