Exactly one month after North Korea bombarded Yeonpyeong island, South Korea's military has staged a brief but large show of force...
South Korean army troops fire shells from howitzers and tanks. Overhead, attack helicopters and jets drop bombs in an exercise to repel a mock North Korean invasion at a training ground 30 kilometers from the heavily fortified border.
Two harvester ants (Pogonomyrmex rugosus) from adjacent nests engaging in ritual warfare, pushing in a display of force but not actually harming each other. It is thought that colonies use these mock battles to gather information about their neighbors. Knowledge about the strength of competing colonies helps ants set territorial borders without loss of life