Intermediate Word:  congeries -  (a) an aggregation  (b) a type of eel  (c) sea shells used for money  (d) a combination of official and unofficial agreements
Difficult Word: - arrant  (a) on a mission  (b) being completely such  (c) arrogant  (d) nonsense

Robot plot revealed!  - C/Net  While a student at MIT, Colin Angle passed by a lab managed by Professor Rodney Brooks. And Brooks picked Angle to help him on a summer robotics project. The end result, unfurled in 1990, was a crab-like walking robot called Genghis. The project helped Brooks get tenure and Angle into grad school. But rather than go to grad school, Angle started a company with Brooks. They later linked up with Helen Grenier, and their efforts became iRobot, one of the early standouts in what appears to be a growing market for autonomous robots.     
Ancient 'footprints' found in Mexico  - Nature  Researchers think they may have found footprints in southern Mexico that mark the oldest evidence for the presence of humans in the Americas. The impressions, preserved in volcanic ash outside the city of Puebla, have been dated to about 40,000 years ago, beating the oldest accepted evidence of humans in the Americas by some 25,000 years. If proven, the prints would lend support to controversial theories that people reached this land much earlier than previously thought. The researchers themselves say more work needs to be done to confirm that they have found the mark of human steps. The prevailing theory is that people first migrated from northern Asia between 15,000 and 10,000 years ago, crossing to America over a land bridge at the Bering Strait. But controversial genetic analyses of Native American populations indicate that some immigrants may have arrived much earlier than that, up to 40,000 years ago. That predates the ice age that held much of North America in its grip some 20,000 years ago. The oldest archaeological evidence is found in Chile's Monte Verde ruins, which contains signs of campfires and other clues of human occupation from about 14,500 years ago.      


Dinosaur track found in Alaskan park - MSNBC  A track from a three-toed dinosaur believed to be about 70 million years old has been discovered in Denali National Park, the first evidence that the animals roamed there, scientists said. The footprint was found June 27 by a University of Alaska Fairbanks student taking a geology field course.  The fossil is 9 inches long and 6 inches wide, officials said. The discovery's importance was its location in Interior Alaska, far from the coastline where other tracks have been found, said Anthony Fiorillo, curator of earth sciences at the Dallas Museum of Natural History.  "It's not necessarily the track itself that's significant," he said.  "It's where it is that's got us all excited."    

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