There was a time when a C meant average. The average GPA at four-year colleges and universities has risen from 2.52 in the 1950s to 3.11 in 2006. And according to Stuart Rojstaczer, a former Duke University professor and founder of GradeInflation.com, GPAs only keep rising. At some colleges, Rojstaczer says, over 50% of the grades given are A's.
Trench warfare was caused by an advance in defensive weaponry. The machine gun was too heavy to be used as a mobile weapon, and therefore was placed into a fixed position. Barbed and concertina wire was also heavily used.
This section shows a full list of all the diseases and conditions listed as a possible cause of Trench mouth in our database from various sources. 1  Emotional stress. 2  Mouth infection. 3  Poor nutrition.  Poor oral 1  hygiene. Smoking.  Throat 1  infection. Tooth infection.  Treponema denticola.