The graduate with a Science degree asks, "Why does it work?"
The graduate with an Engineering degree asks, "How does it work?"
The graduate with an Accounting degree asks, "How much will it cost?"
The graduate with a Liberal Arts degree asks, "Do you want fries with
that?"

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Engineers think that equations approximate the real world.
Scientists think that the real world approximates equations.
Mathematicians are unable to make the connection...

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A Mathematician, a Biologist and a Physicist are sitting in a street
  cafe watching people going in and coming out of the house on the other
  side of the street.  First they see two people going into the house.
  Time passes.  After a while they notice three persons coming out of the
  house.
The Physicist: "The measurement wasn't accurate.".
The Biologists conclusion: "They have reproduced".
The Mathematician: "If now exactly 1 person enters the house then it
   will be empty again."
 
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An engineer, a physicist, and a mathematician are shown a pasture
  with a herd of sheep, and told to put them inside the smallest
  possible amount of fence. The engineer is first.  He herds the sheep
  into a circle and then puts the fence around them, declaring, "A
  circle will use the least fence for a given area, so this is the
  best solution." The physicist is next. She creates a circular fence of
  infinite radius around the sheep, and then draws the fence tight around
  the herd, declaring, "This will give the smallest circular fence around
  the herd." The mathematician is last. After giving the problem a little
  thought, he puts a small fence around himself and then declares, "I
  define myself to be on the outside!"

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In some foreign country a priest, a lawyer and an engineer are
about to be guillotined.  The priest puts his head on the block,
they pull the rope and nothing happens -- he declares that he's
been saved by divine intervention -- so he's let go.  The lawyer
is put on the block, and again the rope doesn't release the
blade, he claims he can't be executed twice for the same crime
he is set free too.  They grab the engineer and shove his head into
the guillotine, he looks up at the release mechanism and says, "Wait
a minute, I see your problem......"
 
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An engineer, a mathematician, and a physicist went to the races one
Saturday and laid their money down.  Commiserating in the bar after
the race, the engineer says, "I don't understand why I lost all my
money.  I measured all the horses and calculated their strength and
mechanical advantage and figured out how fast they could run..."
The physicist interrupted him: "...but you didn't take individual
variations into account.  I did a statistical analysis of their
previous performances and bet on the horses with the highest
probability of winning..."
"...so if you're so hot why are you broke?" asked the engineer.  But
before the argument can grow, the mathematician takes out his pipe and
they get a glimpse of his well-fattened wallet.  Obviously here was a
man who knows something about horses.  They both demanded to know his
secret.
"Well," he says, between puffs on the pipe, "first I assumed all the
horses were identical and spherical..."