But a resource that can be edited by experts and non-experts alike will always carry risks, and perhaps that's Wikipedia's greatest lesson for us all: that its very existence must force us to question notions of accuracy and reliability, while giving us a means to correct errors and add to the global knowledge pot.

CNN: Use with caution: The perils of Wikipedia

The idea of trying to create a zero-harm culture has come out of a global recognition that some patients needlessly suffer or die in hospital because of errors.

BBC: Turn Stafford anger into action, says Obama adviser