51.   Scientists have thought for years that they understood basically what happens inside storm clouds, said Dr. Donald MacGorman of the National Severe Storms Laboratory in Norman, Okla.

52.   Scientists think Europa might have a large, warm ocean, which could habor life.

53.   Scientists think there is little hope of answering life-on-Mars questions until they can study those rocks.

54.   Scientists think they have come up with the first compelling evidence of physiological differences between homosexual and heterosexual females.

55.   Scientists had thought that the first complex societies in the Americas evolved along the Pacific Coast.

56.   Scientists once thought it was an upright and bipedal behemoth that dragged its tail along the ground for support.

57.   Scientists once thought that a billion years or so elapsed before the first appearance of life on earth.

58.   Scientists think that several million comets may be out there.

59.   Scientists think that smaller particles pick up a positive charge, while larger ones have negative charges.

60.   Scientists think the earth is getting hotter.