Technology, for instance, provides the channels through which the others spread. Because it is explosive, it helps to justify the extreme neophilia, and the apocalyptic ideologies. Anti-rationalism is very often a reaction to the consequences of the technology, which are frequently not that pretty. Science is not post-modern. Little filters through to popular thought, and what does is twisted to fit the prevailing fixations.
Chaos theory is the most advanced, and bulks largest in the popular mind.
The lesson the public has received, however, is not that even very complicated things have an underlying simplicity which we can grasp , but that the best scientists now say knowledge is a pointless fraud - see, for instance, Michael Crichton's novel Jurassic Park . Except for some aspects of technology, I don't like these very much, and the century approaching looks grim. We turned the twentieth century into history's abattoir with far less power at our disposal, and only a few massive ideologies. With hundreds and thousands of small, virulent ones, we may avoid the truly titanic conflicts that embroiled the planet for most of this century, only to have a handful of Vietnams and Cambodias, a dozen Bosnias, a score of Lebanons, and a thousand increasingly violent and destructive Jonestowns. We could make ourselves more rational, or kinder, or both.