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Skulls of these species uncovered during the past 40 years in the northeastern part of Africa, in Ethiopia and Kenya, differed considerably from those found in South Africa; as a result, researchers think that two separate robustus-like species—a northern one and a southern one—existed. In 1978 Donald C. , along with his colleagues, identified still another species of Australopithecus. Johanson and his team had been studying a small number of hominid bones and teeth discovered at Laetoli, as well as a large and very important collection of specimens from the Hadar region of Ethiopia (including the famous “Lucy” skeleton).

The transfer of data to and from the FPGA increases power consumption and may slow down the computations. Fortunately, researchers are developing advanced FPGAs that contain memory, arithmetic processing units and other special-purpose blocks of circuitry. André DeHon and Thomas F. , of the Massachusetts Institute of Technology have proposed an FPGA that stores multiple configurations in a series of memory banks. In a single clock cycle, which is on the order of tens or hundreds of nanoseconds, the chip could swap one configuration for another configuration without erasing partially processed data.

This collision takes two forms. Through most of the length of California (a strike-slip margin), the North American Plate slips sideways past the Pacific Plate along a system of nearvertical fractures in the earth collectively known as the San Andreas Fault. Farther up the coast (a convergent margin), the North American Plate is bulldozing its way over a sliver of oceanic crust named the Juan de Fuca Plate. NEW ORLEANS MISSISSIPPI DELTA GULF COAST Scientific American June 1997 85 Copyright 1997 Scientific American, Inc.

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[Magazine] Scientific American. Vol. 276. No 6

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