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.
And for more than 2, 000 years, it was not a nation-state but a civilisation-state.
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.
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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Inside he will find a paradox: an institution as complex as a civilisation, both more enlightened and benighted than he imagines.
Any nearby civilisation with similarly leaky transmitters would thus give itself away, even if it were not broadcasting deliberately into space.
But from the late 1960s onwards, as the perfume of joss sticks drifted over Western civilisation, yoga caught on there too.
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The leadership aimed to draw a direct link back to ancient civilisation.
The prime minister refused to be drawn directly about Italian prime minister Silvio Berlusconi's controversial remarks about the "superiority" of Western civilisation.
Email is, of course, quite lovely and a boon to human civilisation.
Mr Allawi, himself a Shia Muslim, believes the mystical (or Sufi) tradition must be an integral part of the revival of Islamic civilisation.
Along the way, he exposes readers to early British civilisation, Egyptian pyramids, ancient Assyria and the Kingdom of Benin in the 13th century.
He was an extraordinarily wide-ranging historian, producing more than 20 books that encompassed, between them, most of the cultural development of western civilisation.
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