Heart-rate variability, says Dr Stein, is a good index of the degree of control an individual has over his autonomic nervous system (which controls many of the internal organs).

ECONOMIST: Diet and behaviour

Last year, a water plant in Texas disconnected its control system from the Internet after a hacker posted pictures of the facility's internal controls.

WHITEHOUSE: Taking the Cyberattack Threat Seriously

The new TV Sound On feature allows users to instantly activate the system's 1, 330-watt sound while muting the internal TV speaker with a single click of the remote control.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first