As a fun exercise, check out all of the countries where the "Arab Spring" has been taking place (e.g. Iran, Tunisia, Libya, Egypt). All have a characteristic "b

As a fun exercise, check out all of the countries where the "Arab Spring" has been taking place (e.g. Iran, Tunisia, Libya, Egypt). All have a characteristic "bulge" around the 20 age range. There is a tendency for infant mortality to drop (as a consequence of better health care) before fertility does (as a consequence of improved standard of living). The result is a bulge, and as these bulges come of age, they usually lead to revolution...