Recently, scientists have claimed that they were able to re-grow a mans severed finger by applying an experimental powder. Known as 'pixie dust', this miracle powder apparently caused the finger to grow back to its original size and shape in 4 weeks and gave the finger nails and finger prints in just 4 months.
UPDATED The Bad Science blog has debunked this story in vivid detail.
An analysis of this amazing story can be found at Plasmetic's blog. The original Daily Mail (UK) news report is here.