It is these 21st century anxieties--anxieties about changes from outside America that seem beyond average Americans' control--that represent the Republicans' best shot at unhorsing Obama now.

Moreover, it is discussed how to extract key frames from every shot. A method is analyzed that the number of key frames extraction changes automatically with time of shot content.

The possibility and the risk of some shots being fired, or some aircraft or ship being shot at, has increased markedly, because of Chinese unilateral changes to the status quo.