Tag: Population

What is a Pandemic?

A pandemic is the worldwide spread of a new disease, usually a virus.  A pandemic happens when a new virus spreads around the world, and most ...

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What is Patient Zero?

The expression patient zero comes from epidemiology. In medical terms it is the first person infected in an epidemic or a pandemic.&nbs...

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An Urban Future

Much progress has been made to reduce the number of the global urban population living in slums. But still more than one billion people continue to li...

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