How far can a dentist’s drill go?

When ESA’s Mars Express reaches the Red Planet in December 2003, there will be a drill on board its Beagle 2 lander. This drill will dig into the surface to take samples of the Martian rocks. Who would imagine that the creativity of an enthusiastic dentist is behind a ‘cosmic’ drill?

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http://www.esa.int/export/esaCP/SEME425V9ED_Expanding_0.html