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With the spread communism and the threat posed by the Soviet Union's increasing sphere of influence, President Truman established the Truman Doctrine in March 1947, by shifting U.S. foreign policy away...

Following the Cold War, the U.S. underwent a "unipolar moment", positioning itself as world hegemon with the world's strongest economy and geopolitical influence.  However, many factors have ...

This is a common question in A-level physics and a core concept for the course.  

Fission occurs when a heavy nucleus splits into smaller, more stable nuclei, releasing energy in the proc...

This kind of question demonstrates the fact that certain problems can be expressed in much simpler ways so they be easily solved.  In this particular example the question can be simplified to "int...

i) Concentration of reactants, or pressure for gases-  As there are more particles in a certain volume, they collide more often so there is a greater chance of successful collisions per unit timeii) Press...