Economists, typically baffled by selflessness, have tended to hunt for hidden self-interest in apparent altruism.

ECONOMIST: Why a new golden age of philanthropy may be dawning

While inflation is mainly hidden now, it will become apparent by the second of half of this year.

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"The Remove Hidden Data add-in is a tool that you can use to remove personal or hidden data that might not be immediately apparent when you view the document in your Microsoft Office application, " says the instructions on Microsoft's website.

BBC: NEWS | Technology | Warning over Microsoft Word files