Even if the issuer takes half of that and pays it back to cardholders in the form of outlandish perks, the profits are still good, says Curtis Arnold, editor of CreditRatings.com.

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The state-run weekly, which also comes in digital form, aims to explain "the relationship between China and the African continent, " its editor says.

BBC: China Daily newspaper launches Africa edition

In an interview, Jeffrey Drazen, the NEJM editor in chief, said that picking a method of analysis after seeing the data is bad scientific form.

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