Why teachers need a vacation?

Teachers deserve a long and paid vacation in the Caribbean Islands, right? Why, read the selected excerpts below from student tests:

"Charles Darwin was a naturalist who wrote the organ of the species" (ADPRIMA, 1997-2009). 
"Benjamin Franklin produced electricity by rubbing cats backwards" (ADPRIMA, 1997-2009).

"The theory of evolution was greatly objected to because it made man think" (ADPRIMA, 1997-2009).
"Three kinds of blood vessels are arteries, vanes and caterpillars" (ADPRIMA, 1997-2009 ) .

"The process of turning steam back into water again is called conversation" (ADPRIMA, 1997-2009). 
"Algebraical symbols are used when you do not know what you are talking about" (ADPRIMA, 1997-2009).

"The pistol of a flower is its only protection against insects"(ADPRIMA, 1997-2009).

"Dew is formed on leaves when the sun shines down on them and makes them perspire" (ADPRIMA, 1997-2009).

"A triangle which has an angle of 135 degrees is called an obscene triangle" (ADPRIMA, 1997-2009).

"When you haven't got enough iodine in your blood you get a glacier" (ADPRIMA, 1997-2009).

"For fractures: to see if the limb is broken, wiggle it gently back and forth" (ADPRIMA, 1997-2009).

"For asphyxiation: apply artificial respiration until the patient is dead" (ADPRIMA, 1997-2009 ).

Reference: ADPRIMA (1997-2009). Education Humor. Retrieved from http://www.adprima.com/humor.htm on 20 Nov. 2009.