I just started reading The Tipping Point by Malcom Gladwell. The idea is that small causes result in big effects. For example, from the introduction:
Have you ever thought about yawning, for instance? yawning is a surprisingly powerful act. Just because you read the word “yawning” in the previous two sentences - and the two additional “yawns” in this sentence - a good number of you will probably yawn within the next few minutes…If you’re reading this in a public place, and you’ve just yawned, chances are that a god proportion of everyone who saw you yawn is now yawning too, and a good proportion of the people watching the people who watched you yawn are now yawning as well, and on and on, in an ever-widening, yawning circle.
I yawned 4 times reading it, and 3 times typing. ¿Y tú?