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

To test her hypothesis about the detrimental effects of power on advice-taking, See and her colleagues conducted four different pieces of research.

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The current iPad logged nine hours and 58 minutes on the same test (albeit while driving a much more power-hungry screen) and the Fire lasted five hours and 47 minutes.

WSJ: From Google, the Toughest Challenger to the iPad

In my test, where I use full brightness, disable power-saving software, leave on the Wi-Fi, and play a loop of music, the battery on the XPS 13 lasted just under four hours, the worst I've seen on an ultrabook.

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