Arthur C Clarke
A hundred years ago, the electric telegraph made possible - indeed, inevitable - the United States of America. The communications satellite will make equally inevitable a United Nations of Earth; let us hope that the transition period will not be equally bloody.
Any sufficiently advanced technology is indistinguishable from magic.
As our own species is in the process of proving, one cannot have superior science and inferior morals. The combination is unstable and self-destroying.
At the present rate of progress, it is almost impossible to imagine any technical feat that cannot be achieved - if it can be achieved at all - within the next few hundred years.
But the only way of discovering the limits of the possible is to venture a little way past them into the impossible.
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