However, the process stops before it is complete, leaving a partially separated egg which develops into a conjoined foetus.

BBC: NEWS | Health | Medical notes | Conjoined twins

And although birth rates are dropping in most developing countries, particularly those experiencing rapid economic growth, it will likely be decades before population stops increasing in most of the developing world.

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It took exactly two stops before we got to the first soccer-themed demonstration: the Fraunhofer Institute for Integrated Circuits showed off the advantages of embedding chips in soccer balls, along with the shoes of the players.

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The island of Madeira was one of the last European stops before heading across the Atlantic, it was common for merchants to toss a barrel or two on board.

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Before the program stops making use of the processor, it registers its change of activity with Windows Push Notification Services (WNS) - software that runs on Microsoft's remote computer servers.

BBC: Skype slashes battery use for Windows 8 system launch

The challenge we have is that we have not seen a leak like this before, and so people are going to be frustrated until it stops.

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It will make 30 stops over 15 days, ending in Concord, New Hampshire, one day before the critical congressional elections.

CNN: STORY HIGHLIGHTS