TUCSON, 1994 - Our protagonist is listening to “Alive” by Pearl Jam, doesn’t understand that the “she” in the first verse (mother) and the “she” in the second verse (lover) are presumptively different people and gets the same sick feeling occasioned by freaky stories on Usenet

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Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.