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How many people are…?
100 - 2x Bus
1,000 - Long train
10,000 - Local Gov ward
100,000 - UK Gov constituency
1,000,000 - Dublin urban area
10,000,000 - Greater London
100,000,000 - Germany
1,000,000,000 - N and S Americas
@h2g2bob
10,000,000,000 - the 2050s
100,000,000,000 - everyone has has ever lived
1,000,000,000,000 - the United Federation of Planets
10,000,000,000,000 - the Culture