51.   Would have prohibited most public school students from performing harmful experiments on live vertebrate animals.

52.   A similar experiment was performed last week in order to advise the current Mir crew how the mission might best be carried out.

53.   Both groups are performing experiments with animals and predict it would take about five years before the first clinical trials are conducted on humans.

54.   But officials deny any experiments were performed on humans.

55.   But officials have denied that any experiments were performed on humans.

56.   During the journey, team members performed experiments suggested by middle school girls and shot videotape and photos for a documentary and a CD-ROM.

57.   Iraq has denied performing such experiments on humans.

58.   Iraq has denied performing any experiments on humans.

59.   Now, he said, the experiments are being performed bloodlessly.

60.   Roentgen had discovered X-rays accidentally, while performing an experiment on electrically charged particles inside a vacuum tube.