In addition to making Belfast look like a war zone, at least on television, the dissidents drove a wedge between politicians and police.

The strains in euro-zone bond markets this year show that there are other ways for markets to drive a wedge between the strong and the weak.

The results show that: 1 the destruction develops first from the center line of both sidewalls of roadway, after the local failure, there gradually formed a pair of "wedge" failure zone.