61. Since 1986 enrollments of African Americans, American Indians, and Hispanic Americans in full-time engineering programs in the United States have steadily increased, while the number of other students entering the field has fallen.

　　62. A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes.

　　63. A proposal has been made to trim the horns from rhinoceroses to discourage poachers; the question is whether tourists will continue to visit game parks to see rhinoceroses once the animals' horns have been trimmed.

　　64. The technical term "pagination" refers to a process that allows editors, rather than printers, to assemble the page images that become the metal or plastic plates used in printing.

　　65. The only way for growers to salvage frozen citrus is to have it quickly processed into juice concentrate before warmer weather returns and rots the fruit.

　　66. Unlike a typical automobile loan, which requires a 15 to 20 percent down payment, a lease-loan does not require the buyer to make an initial deposit on the new vehicle.

　　67. Defense attorneys have occasionally argued that their clients' misconduct stemmed from a reaction to something ingested, but if criminal or delinquent behavior is attributed to an allergy to some food, the perpetrators are in effect told that they are not responsible for their actions.

　　68. Many people, willing to admit that they lack computer skills or other technical skills, are disinclined to recognize that their analytical skills are weak.

　　69. A report by the American Academy for the Advancement of Science has concluded that many of the currently uncontrolled dioxins to which North Americans are exposed come from the incineration of wastes.

　　70. Displays of the aurora borealis, or "northern lights," can heat the atmosphere over the Arctic enough to affect the trajectories of ballistic missiles and induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.