
Check out this great video from PPH's Digital Expansion Initiative.
Why do wars and revolutions happen? We do not know. We know only that to produce the one or the other men [sic] form themselves into a certain combination in which all take part; and we say that this is the nature of men [sic], that this is the law" -Leo Tolstoy, War and Peace
"A phase transition is a sudden, global change in behaviour arising from the interactions of many constituent particles" -Philip Ball, Critical Mass: How One Thing Leads to Another