Health

Q&A: The importance of sleep regularity

Americans have become increasingly aware of the fact that they just don't get enough sleep. However it turns out that's not the whole story. Duration is important but so is regularity.

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Population

In biology, a population is the collection of inter-breeding organisms of a particular species; in sociology, a collection of human beings. Individuals within a population share a factor may be reduced by statistical means, but such a generalization may be too vague to imply anything. Demography is used extensively in marketing, which relates to economic units, such as retailers, to potential customers. For example, a coffee shop that wants to sell to a younger audience looks at the demographics of an area to be able to appeal to this younger audience.

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