for smart heads: puzzle

Two guys go to a lumber yard.

One guy tells the clerk "We need some two-by-fours"

The clerk says "Okay, how long do you need them?"

The two guys discuss this for a minute, then one says to the clerk: "A very long time. We're building a house."
 
A cop pulls Heisenberg over for speeding.

The cop says "Do you know how fast you were going, sir?"

Heisenberg answers "No, but I know where I am"
 
He is a very famous physicist who got very famous with the uncertainty relations:
the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time.
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