The whole less than the sum?

Are molecules smarter than people? An argument can be made ....

Add additional molecules to a gas and they'll quickly disperse through the gas until pressure is equalized. Add additional commuters to a subway car, and they'll congregate near the doors, in effect establishing a higher pressure of commuters there than in the spaces between the doors. Most stand cheek to jowl by the doors, with few if any dispersing into lower pressures of the mid-car spaces.

This experiment is not only reproducible, but is reproduced every day, on almost every train.

Molecules, or people? You be the judge.

Note: this was originally posted on ketches, yaks & hawks 7 May 2008