I'm never going to _enjoy_ sticking a long-ass needle in my thigh and my native squeamishness always drags the process out too long; still, each Saturday morning right after making the date with my endocrine system is when it most feels like accounts are settled, briefly, with the world and it might be possible to move on.

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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.