51.   In the process diamond crystals were work-hardened under extreme heat and pressure to give their faces abrasion resistance without bonding them together.

52.   In response to extreme heat, a very weak low will form over the Southwest.

53.   It holds in moisture, stifles weeds and protects plants against extreme heat and cold.

54.   Many analysts expect reduced yields from last week as the Midwest was affected by extreme heat and humidity.

55.   Many of these are in the Southeast and the West, where extreme heat in the summer is a regular part of life.

56.   Meanwhile, west Texas will sizzle in extreme heat Saturday.

57.   Michigan coach Lloyd Carr gives his players Popsicle breaks in extreme heat.

58.   More tragically, by moving eastward to more dangerous terrain, many illegal immigrants have died from exposure to extreme heat or cold while trying to cross.

59.   Most important, children do not cope with extreme heat and humidity as well as adults.

60.   No one goes so far as to say football and extreme heat may be incompatible.