by Carl Pierer

Starting from the formidable climatic challenges faced by cities on the Iranian plateau, Part I of this essay presented the ingenious Iranian invention of Qanats. Those underground aqueducts, which exploit gravitation to redirect an aquifer under a mountain to the surface, are remarkable feats of engineering. Covering distances of several kilometres, they permitted permanent settlements in landscapes otherwise hostile to agriculture. The previous part also argued that qanats have an impact on the settlements they supply with water in three ways. First of all, qanats allowed older settlements – predominantly located in river valleys – to support a larger population, since more land became available for agriculture through irrigation. At the same time, previously inhospitable places, where water cannot be accessed in other ways, could now be permanently settled. Secondly, villages and cities formed in accordance with the course of the water supply. This is particularly noticeable in settlements featuring a single qanat: they have a triangular shape at the top of which are orchards and gardens and further downhill the distribution channels fan out to allow a larger area to be irrigated. At the lower end, a grid of rectangular plots is located, which is designed in such a way that enough water is delivered in the time it takes to flow through the plot. Thirdly, the presence of qanats makes social stratification physically visible. Because qanats have a one directional flow, locating higher up on the canal means earlier access to – and therefore fresher – water. It is thus that richer households will locate further uphill, with the poorest inhabitants living just before the water reaches the fields for irrigation. Read more »




Spectator sports can reflect a society’s worst inclinations by promoting pure partisanship.

I have a friend who is a travel agent. The days when we all talked on the phone to travel agents in order to book any travel are long gone. These days, for the most part, travel agents, the actual human ones, deal with business travel and high end travel for elites. My friend was telling me about being contacted by a client who was the high end elite type, at 3am, saying her email wasn’t working and could my friend text her their itinerary. Now putting aside the obnoxious behavior in expecting a reply from anyone at 3am, my first response was “doesn’t she use Tripit?” Or Google Trips, or even the airline mobile apps? At any given time, I can find all my travel details in all of those ways and sometimes others (business trips get automatically put in my Google calendar). Travel is so automated and online now, it’s amazing to me that anyone wouldn’t take advantage of these tools. 


Although some may be heralding the end of free speech, 2018 has been a year of far-reaching debate and discussion. In the coming months, we can anticipate attending or streaming discussions ranging from such topics as the role of race in American politics to the nature of truth, from existential threats posed by artificial intelligence to the value of religion.


How can we toggle the immune system’s “off switch”? How do we deactivate the cells and molecules which form an essential line of defense for our body and protect us against invading pathogens once their job is done? Persistent inflammation after pathogens are eliminated can be very harmful to the body because oxidants and other injurious molecules produced by immune cells end up attacking the body’s own tissues and organs instead of the pathogens.