The plasma needle, is cold and painless to the touch. The needle's creator, physicist Eva Stoffels-Adamowicz, who is based at the Eindhoven University of Technology in the Netherlands, says it could also be used to painlessly remove cancerous tissue.
Stoffels-Adamowicz came up with the idea for the needle while working with low-pressure plasmas, which are created in a vacuum. In order for the plasma to be used on people, she and her colleagues developed a plasma needle that works in air.
Read more about this at the New Scientists website.
Other links:
http://physicsweb.org/articles/news/7/11/15/1#needle
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