It's got a needle, like a record needle, that goes back and forth over the surface, bumps up and down, and feels the height of the first surface.

So, imagine I have a plank about two feet wide and 30 feet long and I'm going to walk on it, and you see I can walk on it without looking, I can go back and forth and I can jump up and down.

Armed groups travelled back and forth across borders conflicts within different countries became intertwined alliances among Governments and rebel movements in the region shifted as each sought to gain advantage over others.

Such image handling techniques could be integrated within existing, unattended monitoring systems already in use with the IAEA that automatically verify that they have not been tampered with by sending encoded signals back and forth to the IAEA control centre.

There's been more raw DNA of communications and media thrown out there. Content is moving from shows to particles that are batted back and forth, and part of social communications, and I think this is going to be a time of great renaissance and opportunity.

There are no regularly scheduled shipping services to Somalia, but individual ships from anywhere in the region, or the world, carry cargo to or from any of the more significant Somali seaports Kismaayo, El Ma'an, Marka, El Adde (Mogadishu), Berbera and Bossaso.

So along about September they can stride in and go, I'm important today.

China and India have been crisscrossing the globe making financially and politically costly deals to try to lock up the output of new oil producing countries.

You don't know how far that street is and you don't know if you're going straight and you hear cars whizzing back and forth, and you had a horrible accident that landed you in this situation.

Ireland has thrown Europe into its second sovereign debt crisis this year, and capital markets have become schizophrenic, with investment rushing back and forth across the Atlantic in response to contagion risk in Europe and quantitative easing in the United States.

He was happy to make deals with Democrats to put himself at the head not just of the Republican Party but of the bipartisan Progressive coalition, trying either to yoke the two forces together or to tack back and forth between them to achieve legislative and policy goals.