A homework assignment
      
      
      A math student is pestered by a 
      classmate who wants to copy his homework assignment. The student 
      hesitates, not only because he thinks it's wrong, but also because he 
      doesn't want to be sanctioned for aiding and abetting. 
      
      His classmate calms him down: "Nobody will be able to trace my homework to 
      you: I'll be changing the names of all the constants and variables: a to 
      b, x to y, and so on." 
      Not quite convinced, but eager to be left alone, the student hands his 
      completed assignment to the classmate for copying. 
      After the deadline, the student asks: "Did you really change the names of 
      all the variables?" 
      
      "Sure!" the classmate replies. "When you called a function f, I called it 
      g; when you called a variable x, I renamed it to y; and when you were 
      writing about the log of x+1, I called it the timber of x+1..." 
      
      
      Source: 
      
      
      http://www.math.ualberta.ca/~runde/jokes.html
 
      Why did the chicken cross the 
      road?
      
        Marie Curie: 
        She was radiating with enthusiasm 
        as she crossed the road.
        It didn’t. The 
        rotation of the earth made it appear to cross.