51.   If the primary means of deciding to attack a human is based on scent, then a frightened human has a perfect defense.

52.   In particular, humans have a strong ability to recognize images, so computer researchers are exploring ways to use image recognition for passwords.

53.   In recent years, several scientists have found indications that humans still have semiseasonal breeding patterns, with peaks of fertility during spring and fall.

54.   It examines the geology and plant and animal life of the lake, as well as the effects climate and humans have had on it.

55.   It has long been known that humans have separate nerve networks for detecting pain, temperature and touch, Olausson said.

56.   It would be as if a human had great depth perception with one eye closed.

57.   Jesus also said that humans have free will.

58.   Medical experts say that because it is a new virus to which humans have no immunity, it could spread rapidly, infecting millions around the world.

59.   Ms. Simon, who opens her Connecticut home to skunks in crisis, said humans have little to fear from the nearsighted little animals.

60.   NASA plans to use the robot on the international space station for tasks humans otherwise would have to handle on spacewalks.