People had time to build houses, trade and fight - in other words civilisation was born.
That promises to make the uncontacted groups' first brush with civilisation even more surprising.
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And, presumably, a sufficiently advanced civilisation would try to do that if it could.
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But it seems quite odd to do so after 200 years of industrial civilisation.
Civilisation will be ruined when no one has to stand on an assembly line anymore.
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Kipling saw that transport is civilisation, and it is transport that is addressed by the proposals.
Pierre Trudeau added a new home for the National Gallery, and the Canadian Museum of Civilisation.
Indeed, advancing from the second to the first generally marks the start of civilisation.
He felt that modern liberalism was corroding the foundation of Western civilisation, no less.
The prime minister's proposals would serve the terrorists' ends by undermining the civilisation they attack.
And for more than 2, 000 years, it was not a nation-state but a civilisation-state.
Given the means, our enemies would be a threat to every nation and eventually, to civilisation itself.
The comparable status of Civilisation and Tom Keating on Painters was as revealing as it was surprising.
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"We have to find out what happened then ... where and how this civilisation vanished, " he said.
By contrast, the splendid cities of Samarkand, Bukhara and Khiva are monuments to the Uzbeks' Islamic civilisation.
We can go further: the destruction of jobs through mechanisation is what allows civilisation itself to develop.
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We may say also that African cultures are automatically being integrated into the global civilisation through varied human interaction.
The rise of banking has often been accompanied by a flowering of civilisation.
Dr Dahl remains passionate about what this work says about such societies, digging into the deepest roots of civilisation.
The ideas were aspects of what Mr Sarkozy calls his "policy of civilisation".
It is morally good, and support for it is a mark of civilisation.
The centre aims to encourage a better understanding of the culture and civilisation of Islam and of contemporary Muslim societies.
For centuries the country saw itself as an outpost of Christian civilisation, keeping the barbarians in the east at bay.
But the truth of the matter honestly is that this would lead to disaster, for lying is at the heart of civilisation.
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On a more intellectual level, Benedict the theologian has long displayed an acute analysis of Western civilisation's crisis of confidence.
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It cannot include countries who repress their own people, violate fundamental human rights and scorn the fundamental values of western civilisation.
His harsh experiences convince him that he must resist the subjugation by Christendom of the new civilisation that he has discovered.
Inside he will find a paradox: an institution as complex as a civilisation, both more enlightened and benighted than he imagines.
In graphic detail, the murderer cast himself as a latter-day crusader who would redeem European civilisation from invasion by Muslim hordes.
Any nearby civilisation with similarly leaky transmitters would thus give itself away, even if it were not broadcasting deliberately into space.
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