Do You know the difference between a physicist and a mathematician? Well, the following test will tell which type one is: We have a cabin in the woods with an unlighted gas stove, an empty pot and a faucet with cold running water. What steps would you take to get a pot of hot water? Just about everyone answers that they would first pour cold water from the faucet into the pot, then light the stove and then put the pot on the stove. Well, so far, mathematicians and physicists are in agreement, but now comes the crucial test: This time the conditions are the same as before, except that now you have a pot already filled with cold water. How would you now get a pot of hot water? The usual reply is to put the pot of cold water on the stove and then light the stove. Well, this is the response of one who has the temperament of a physicist. A mathematician would dump out the water from the pot, reducing the problem to the previous case, which has already been solved. A more dramatic version of the test is this: We are given a building on fire, a hose and a hydrant. How would you put out the fire? Obviously, one would seem to connect the hose to the hydrant, turn on the water and the put out the fire. Now suppose the conditions are the same as before, only now the building is not on fire. How should you now put out the fire? The physicist would do nothing, whereas the mathematician would set the building on fire, reducing the problem to the previous case, which has already been solved.