Twenty years ago, a Texas court decided Winfrey hadn't defamed the state's cattle industry. At the time, local media struggled to explain the science at stake in the case.
New research has identified a known neurodegenerative disease as being caused by prions. And it has again raised the possibility that these proteins are infectious.
News that a Sydney man has contracted Creutzfeld-Jacob disease serves to highlight that we still don't know how to prevent a disease that most often goes unreported, and unremarked on.