Truth decay: The half-life of facts - science-in-society - 25 September 2012 - New Scientist | cognition |

Much of what we believe to be factual has an expiration date, but the good news is that we can see it coming.


It is obvious that scientific knowledge is continually updated through new discoveries and the replication of studies, but until recent years little attention had been paid to how fast this change occurs. In particular, few had attempted to quantify how long it would take what we know at any given moment to become untrue, or replaced with a closer approximation of the truth.