I'll add one more example to the others: picture a crowded hallway full of people all trying to move in the same direction. The flow of people is quite slow, b

I'll add one more example to the others: picture a crowded hallway full of people all trying to move in the same direction. The flow of people is quite slow, but if one person in the back trips and pushes the next person and so on, the domino effect will travel much faster than the individual people.