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First I would look at the general function of portraiture in the 15th century which was primarily to memorialize the features of the patron for posterity and to ensure rememberance, as well as to celeb...

In German, articles are a bit more complicated than in English. 

Instead of only using 'the', you have 'der', 'die' and 'das'  which are all definite articles. 'Der' is masculin, 'die' is...

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...