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What if the particles miss each other, and don't collide?
I mean ... they're very small.
How do they get them to collide?
BTW, I read another article in my Scientific American last night, about research into how we subconsciously communicate with body chemicals, and the research carried out by someone called Martha McClintock, and the McClintock Effect, before the word "pheromone was ever coined.
I'm quite enjoying Scientific American. I might have to buy it more often.