71.   In a paper published two years ago, Asphaug and colleagues reported that computer simulations suggested that many asteroids were aggregates of debris from previous collisions.

72.   In computer simulations of astrophysical phenomena, Kane explained, one works backward from the present to the beginning.

73.   In development, testing that used to be done with vehicles is now done by computer simulation.

74.   In both experiments and computer simulations, it is possible to calculate the complicated paths that light beams take as they bounce among the four silvered balls.

75.   In one recent example, physicists at Purdue have come up with computer simulations that capture, with astounding accuracy, the behavior of drops from inception to fall.

76.   In detailed computer simulations, Hills and his colleagues have studied how such huge tsunamis would affect different coastal regions.

77.   In studying computer simulations of life, some theorists have argued that sophisticated simulations are themselves primitive life forms.

78.   In the formal computer simulations of the economy that lie behind nearly all forecasts, prices are sticky.

79.   In this age of computer simulation and instant global communication, some things must still be done the old-fashioned way.

80.   Indeed, they hope the real flights will help improve their computer simulations.