<P> Dorothy L. Sayers argued that the question was "simply a debating exercise" and that the answer "usually adjudged correct" was stated as, "Angels are pure intelligences, not material, but limited, so that they have location in space, but not extension ." Sayers compares the question to that of how many people's thoughts can be concentrated upon a particular pin at the same time . She concludes that infinitely many angels can be located on the head of a pin, since they do not occupy any space there: </P> <P> The practical lesson to be drawn from the argument is not to use words like "there" in a loose, unscientific way, without specifying whether you mean "located there" or "occupying space there ." </P> <P> In the humoristic magazine Annals of Improbable Research, Anders Sandberg has presented a calculation based on theories of information physics and quantum gravity, establishing an upper bound of 8.6766 × 10 angels . </P> <P> The comic Saturday Morning Breakfast Cereal poses an answer derived from physics to this question, i.e. between one and 30 vigintillion angels . </P>

How many angels can dance on the tip of a needle