“Logic is our assurance,” MacDonald said calmly. “The only thing worth sending from star to star is information, and the certain profit from such an exchange far outweighs the uncertain advantage from any other kind of behavior. The first benefit is the knowledge of other intelligent creatures in the universe—this alone gives us strength and courage. Then comes information from an alien world; it is like having our own instruments there, even our own scientists, to measure and record, only with the additional advantage of a breadth and duration of measurements under a variety of conditions. Finally comes the cultural and scientific knowledge and development of another race, and the treasure to be gained from this kind of exchange is beyond calculation.”