Scientists have deployed hundreds of tiny, experimental robots to help with biopsies. They're as small as a speck of dust. They look like tiny ninja throwing stars. And researchers use magnets to retrieve them.
Source: http://www.npr.org/blogs/health/2013/04/26/179213090/freaky-friday-autonomous-tissue-grabbers-are-on-their-way?ft=1&f=1007
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