If you have running virtual systems that are based on this image and the anti-virus software vendor releases new updates, you probably want to apply those updates to the virtual systems.

In a classic study done over a decade ago, Norwegian researchers looked at the way taxi drivers in Oslo behaved with and without airbags and anti-skid braking systems fitted to their vehicles.

It's clear that bad information propagates easily through these systems - especially given some Americans' anti-paternalistic proclivities - but they can also be used to send out critical messages.