"Pull-ad" clauses are provisions in a contract between an advertiser and a publication that give the advertiser wiggle room to remove its ads from an issue at the last minute or move them elsewhere in the publication so they don't run alongside news of major catastrophes, or even against pages containing stories about itself.

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The best business concepts born in 2012 were those with high demand and room to grow, the publication said.

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That revelation, which has been submitted for publication to Physical Review Letters, leaves no room for doubt: B-bars turn into B-minuses far faster than B-minuses turn into B-bars.

ECONOMIST: The arrow of time

It believed publication of the photos - taken in a Las Vegas hotel room - would constitute an invasion of privacy.

BBC: Prince Harry naked photos prompted palace call to PCC

While space in that publication is always at a premium and my analysis ended up on the cutting room floor, yours truly was also asked to show how the seasonally favorable six months of the year played out in presidential first years.

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