With a tandem jump you sign a release form, put on a jumpsuit and are quickly shown what to do once you leave the plane: how to cross your arms and bend your legs while in mid-air.

BBC: Falling into New Zealand, from 10,000 feet

Passengers were given a meal on board before being told they could leave the Sri Lankan Airlines plane and spend the night in the airport, or risk going home and not making it back for the flight departing on Sunday.

BBC: Heavy snow and ice bring travel chaos across UK

Having established the principle, Dr Huang and Dr Galinsky went on to test the effect of posture on other power-related decisions: whether to speak first in a debate, whether to leave the site of a plane crash to find help and whether to join a movement to free a prisoner who was wrongfully locked up.

ECONOMIST: How you hold yourself affects how you view yourself