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Historians acknowledge many factors causing the outbreak of war in 1939, however it is a culmination of these factors that must be seen as the ultimate cause in triggering the beginning of World War Two. ...

Both of these elements are part of the 2nd group of elements on the periodic table. ie in first ionisation, their electron configuration changes from nS2 -> nS1.

Strontium is a much larger eleme...

dy/dx = 3x^2-2x+6

At (1,5), dy/dx = 7. 7 is the gradient of the tangent, therefore the gradient of the normal at (1,5) is -1/7.

The subjunctive is a 'mood', not to be confused with 'tense' since a mood can have more than one tense. The present form of the subjunctive is the most common in French t...

Portions of proteins can arrange in regularly repeating structures such as α-helices: the vast majority of these helices are right-handed (the left-handed versions are very rare). Similarly, DNA (double) ...