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			People strongly distrust others on the Metro -- muggers, crazy people, pickpockets, the homeless... The built-in suspicion is probably what kept a lot of the parents moving their kids on in such a hurry. 
 On the metro, one's frame of mind is set to 'endure', not 'enjoy' or 'learn'.  Teachers, artists & entertainers know that a receptive frame of mind is very important to 'reaching' someone.
 
				__________________per·son \ˈpər-sən\ (noun) - an ephemeral collection of small, irrational decisions
 The fun thing about evolution (and science in general) is that it happens whether you believe in it or not.
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