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51. Gasoline marketing is undergoing major changes as stations often not only add convenience stores but also combine with major fast-food chains to build complexes where customers can shop and eat as well as buy gasoline.

52. In addition to her work on the Miocene hominid fossil record, Mary Leakey's contributions to archaeology include her discovery of the earliest direct evidence of hominid activity and her painstaking documentation of East African cave paintings.

53 Most vaccines are derived from weakened or killed strains of the same virus that they prevent, unlike smallpox vaccine, which is derived from a different virus altogether.

54. In cooking, small quantities of spices are used, whereas in medicinal usage spices are taken in large quantities in order to treat particular maladies.

55. Shipwrecks are more likely to be found undisturbed at great depths than in shallow coastal waters, where archaeological remains are exposed to turbulence and are accessible to anyone in scuba gear, whether they be archaeologist, treasure hunter, or sport diver.

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56. First discovered more than 30 years ago, Lina's sunbird, a four-and-a-half-inch animal found in the Philippines and resembling a hummingbird, has shimmering metallic colors on its head; a brilliant orange patch, bordered with red tufts, in the center of its breast; and a red eye.



57. The Anasazi settlements at Chaco Canyon were built on a spectacular scale with more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.

58. The country's currency, weakened both by concern about the government's agreement with the International Monetary Fund and by growing fears of a rise in inflation, continued its slide to a record low against the dollar, forcing the central bank to intervene for the fourth time in a week.

59. A new genetically engineered papaya was produced not by profit-motivated seed companies, as was the case with most genetically modified crops previously approved for commercial use, but by university and United States Department of Agriculture researchers who allowed growers to use it free of charge.

60. Immigrants from the Mideast exhibit rates of entrepreneurship exceeding those of virtually every other immigrant group in the increasingly diverse United States economy.

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61. The bones of Majungatholus atopus, a meat-eating dinosaur that is a distant relative of Tyrannosaurus rex and closely resembles South American predatory dinosaurs, have been discovered in Madagascar.

62. After analyzing data gathered by weather satellites, scientists report that the Earth's northern latitudes have become about ten percent greener since 1980, due to more vigorous plant growth associated with warmer temperatures and higher levels of atmospheric carbon dioxide.

63. Unlike emergency calls that travel through regular telephone lines and thus automatically inform the operator of the location and phone number of the caller, cellular calls require emergency operators to determine the location of the caller.

64. Recently documented examples of neurogenesis, the production of new brain cells, include the brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that learn new songs.

65. Developed by Pennsylvania's Palatine Germans about 1750, Conestoga wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and a floor that was curved upward at both ends to prevent cargo from shifting on steep grades.

66. Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

67. Scientists say that each of the photographs taken of the Ares Vallis plain by the Mars Pathfinder indicates the overwhelming extent of the flooding on the planet billions of years ago and the degree to which rocks were scattered by its force.

68. The best way to extract the flavor from saffron threads is to soak them in liquid after pounding them with a mortar and pestle.

69. The proliferation of so-called cybersquatters, people who register the Internet domain names of high-profile companies in hopes of reselling the rights to those names for a profit, the passage in 1999 of the Anti-Cybersquatting Consumer Protection Act, which allows companies to seek up to $100,000 in damages against those who register domain names with the sole intent of selling them later.

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