That is a fascinating article and experiment, although it doesn't surprise me that most people gave up their seats. If I were on a subway and somebody asked for

That is a fascinating article and experiment, although it doesn't surprise me that most people gave up their seats. If I were on a subway and somebody asked for my seat, my highest-probability hypotheses are that they have a physical condition that isn't immediately obvious, or that they're just weird. In the first case I should obviously get up, and in the second case it's not worth trying to determine if they'll have a negative reaction if I refuse.