This week's Nature magazine contains a short note by Philip Ball pointing to
a result about optimal plane boarding
http://arxiv.org/abs/0802.0733 which
is a pretty neat piece of pedestrian modeling.
There's also a research report on the genetics of cooperation in slime mold,
http://www.nature.com/nature/journal/v451/n7182/abs/nature06558.html-- rec --
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