And they continued to come in for seventy-nine minutes. Then they broke off and the new transmission was repeated. The original message was no longer sent. Robot transmitter or no robot transmitter, the first message had been transmitted at regular intervals for something like seventy-six hours and then, instantly on receipt of the beginning of an answer, a new broadcast took its place. The reaction had been immediate. The distance between M-387 and Earth could be computed exactly. The time needed for the Earth signal to arrive was known exactly. And the instant--the very instant--the first sound from Earth reached M-387, the second message had begun. There was no pause to receive all the Earth greeting, or even part of it. The reaction was immediate and automatic. Automatic. That was the significant thing. The new message was already prepared when the Earth signal arrived. It was set up to be transmitted on receipt of the earliest possible proof that it would be received. The effect of this rapid response was one of tremendous urgency--or absolute arrogance. The implication was that what Earth had to say was unimportant. The Earth signal had not been listened to. Instead, Earth was told something. Something crisp and arbitrary. Maybe there could be amiable chit-chat later on, but Earth must listen first! The beepings could not be anything but a guide, a directional indicator, to be followed to M-387. The message, now changed, might amount to an offer of friendship, but it also could be a command. If it were a command, the implications were horrifying. At the moment of first release, the news had only a limited effect. Most of Europe was asleep and much of Asia had not waked up yet. But the United States was up and stirring. The news went to every corner of the nation with the speed of light. Radio stations stopped all other transmissions to announce the frightening event. It is of record that four television stations on the North American continent actually broke into filmed commercials to announce that M-387 had made a response to the signal from Earth. Never before in history had a paid advertisement been thrust aside for news. In the United States, then, there was agitation, apprehension, indignation, and panic. Perhaps the only place where anything like calmness remained was inside and outside the office of Burke Development, Inc., where Burke felt a singular relief at this evidence that he wasn't as much of a fool as he feared. "Well," he thought. "It looks like there _is_ something or somebody out there. If I'd been sure about it earlier--but it probably wasn't time." "What does this mean?" asked Sandy. "This horrible spell of around-the-clock working! Are you still trying to do something about the space signals?"