Yesterday I read in Scientific American that the record for the hottest chilli pepper has been officially broken. The new champion is Pepper X and is listed in the Guinness Book of Records. The plant breeder was the appropriately named Ed Curry (see nominative determinism), who also produced the previous record holder, the Carolina Reaper.
The Scorville rating of the new pepper is 2,693,000 SCU. Here is a chart (courtesy of Wikipedia) that compares this with more familiar varieties of chilli.
