the bottom of the pecking order. often the only way to cross is to step into the road, holding a hand out towards the on-coming traffic and fix the driver with your best "you do not want my death on your conscience" stare. like in an explosion, it starts out at one big cloud of fire and smoke but the smoke eventually breaks up into multiple tiny pieces (many being just dots). these small pieces are called particles. particles usually behave independently from all the other particles.
at the beginning looks a bit wobbly.
thank you! you have been a real help!!! 