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A distinctive jaw, from an 58 australopith named A. bahrelghazali, was recently found in Chad. 0 million years old and is thus roughly coeval with Lucy. In southern Africa, scientists have just reported evidence of another primitive bipedal hominid species. 3 million years old. At about 3 million years ago, the same region begins to yield fossils of A. africanus, the first australopith to be discovered (in 1924). This species may have persisted until not much more than 2 million years ago. 5million-year-old species from Ethiopia, Australopithecus garhi, is claimed to fall in an intermediate position between A.

One dering, multifaceted evolution. could wish for a better record of this ? 8 mil- years ago. As we learn more about H. heidelbergensis, we are lion years ago. A lower jaw that may be about the same age likely to find that more than one species is actually representfrom Dmanisi in ex-Soviet Georgia is distinctively different ed in this group of fossils. In Europe, H. heidelbergensis or a from anything else yet found [see “Out of Africa Again . . ,” by Ian Tattersall; Scientific American, April best-known representative was H.

Conservation of energy requires that a byproduct be a steady stream of positive energy. One could direct the negative energy beam off to some distant corner of the universe, while employing the positive energy to perform useful work. This seemingly inexhaustible energy supply could be used to make a perpetual-motion machine and thereby violate the second law. If the beam were directed at a glass of water, it could cool the water while using the extracted positive energy to power a small motor— providing a refrigerator with no need for external power.

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