Walking

This article is more useful to modellers than the casual reader (take hoe points for the non-modeller are that i look at where i'm going whie i'm walking and am more likely to fall in heavy crowds because of contact with others). But it is interesting to see that the way they can model pedestrian behaviors and what they're thinking it could be useful for (e.g. Robotics).

http://www.pnas.org/content/108/17/6884.full