Urban Careers and the Twenty-Ninth Day
A helpful way for young math students to grasp the concept of exponential growth is to look at water lilies growing on a pond. They grow exponentially and double in area each day. If they will fully cover the pond by the 30th day, on what day is the lake half covered? The twenty-ninth day[1].
This year I had the honor of teaching 4th year energy systems students who will graduate later this month (their blogs on energy issues will be presented on this site over the summer). These graduates are particularly essential. During their careers they will be part of the world’s largest ever city-building spree. Their task will be to again double the world’s cities.




‘From there to here, from here to there, funny things are everywhere!’
First the good news: Earlier this month, Mayor Iñaki Azkuna of Bilbao, Spain was awarded the prestigious
Jesus and Muhammad traveled to the wilderness to develop their teachings. Even Gautama Buddha is said to have sat quietly beneath the rural Bohdi tree while he waited for enlightenment. But once they knew what needed to be said, all three men travelled to the closest city to convey the message.
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Around 5000 years ago, the first cities emerged in Mesopotamia and the fertile valleys of the Tigris and Euphrates Rivers. Agricultural surpluses enabled a few people to start specializing in something other than agriculture. The farmer who now had extra grain could trade for a better spear or a winter fur coat. This specialization and the ability to trade goods and services is the basis of urbanization. And, there was enough food that the starving artist didn’t starve completely, so along with trade, culture emerged.
The next time you're in a new city, maybe jet-lagged, try to wake-up early and take a walk: The earlier the better. Watch as the city wakes, the merchants restock their shelves and workers take away the waste. Street sweepers and garbage collectors take advantage of the quiet streets; people open offices and stores; the calm before the rush. Perhaps your hotel is near a market – check out how early the bakers and farmers start working. A few newspapers are still delivered before the sun rises.
Over the last quarter-century, the number of urban dwellers in South Asia has more than doubled to almost 500 million. In
As a (somewhat) young, professional woman,