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"&lt;p&gt;I recently caught up with David Wettergreen, a research professor at Carnegie Mellon's famed Robotics Institute. Wettergreen must have one of the coolest jobs for a tech-minded person: he designs and builds autonomous robots and then sets them loose in extreme environments. A year and a half ago, I followed him and his crew around Chile's Atacama Desert as they field-tested a next-generation planetary rover called Zoe (see &lt;a href=\" http://www.spectrum.ieee.org/mar06/3059\" target=\"resource window\"&gt;\"Halfway to Mars\"&lt;/a&gt;). &lt;/p&gt;\n\n&lt;p&gt;This winter, Wettergreen has been spending time on a ranch outside Tampico, in northeastern Mexico, putting another bot through its paces. This machine, designed by &amp;hellip;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://spectrum.ieee.org/tech-talk/semiconductors/devices/how_is_a_mexican_sinkhole_like>