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However, that has not stopped new entrants from continuing to join the fray, with novel twists on the basic scanning-probe design.
ECONOMIST: MONITOR
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Nasa's efforts to locate MPL are continuing with cameras on board the orbiting probe Mars Global Surveyor scanning the planet's surface.
BBC: Mars probe canyon crash theory
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Daniel Langleben, of the University of Pennsylvania, in Philadelphia, uses a brain-scanning technique called functional magnetic-resonance imaging to probe his subjects' honesty.
ECONOMIST: Lie detection